Fix a few cppcheck findings

cpu/native/irq_cpu.c

@@ -255,13 +255,10 @@ int _native_popsig(void)
  */
 void native_irq_handler(void)
 {
-    int sig;
-
     DEBUG("\n\n\t\tnative_irq_handler\n\n");
 
     while (_native_sigpend > 0) {
-
-        sig = _native_popsig();
+        int sig = _native_popsig();
         _native_sigpend--;
 
         if (native_irq_handlers[sig].func != NULL) {

cpu/native/native_cpu.c

@@ -101,7 +101,7 @@ char *thread_stack_init(thread_task_func_t task_func, void *arg, void *stack_sta
     unsigned int *stk;
     ucontext_t *p;
 
-    VALGRIND_STACK_REGISTER(stack_start, stack_start + stacksize);
+    VALGRIND_STACK_REGISTER(stack_start, (char *) stack_start + stacksize);
     VALGRIND_DEBUG("VALGRIND_STACK_REGISTER(%p, %p)\n", stack_start, (void*)((int)stack_start + stacksize));
 
     DEBUG("thread_stack_init()\n");

cpu/native/syscalls.c

@@ -188,15 +188,15 @@ int puts(const char *s)
 
 char *make_message(const char *format, va_list argp)
 {
-    int n;
     int size = 100;
     char *message, *temp;
 
-    if ((message = malloc(size)) == NULL)
+    if ((message = malloc(size)) == NULL) {
         return NULL;
+    }
 
     while (1) {
-        n = vsnprintf(message, size, format, argp);
+        int n = vsnprintf(message, size, format, argp);
         if (n < 0)
             return NULL;
         if (n < size)

cpu/x86/x86_memory.c

@@ -365,7 +365,7 @@ static void pagefault_handler(uint8_t intr_num, struct x86_pushad *orig_ctx, uns
         /* print a warning if the page was read before written */
         if (!(error_code & PF_EC_W)) {
             unsigned long *sp = (void *) orig_ctx->sp; /* ip, cs, flags */
-            printf("DEBUG: Read before write on heap address 0x%08x (physical: 0x%016llx) at 0x%08x.\n",
+            printf("DEBUG: Read before write on heap address 0x%08x (physical: 0x%016llx) at 0x%08lx.\n",
                    virtual_addr, pte & PT_ADDR_MASK, sp[0]);
         }
     }

cpu/x86/x86_pci.c

@@ -218,6 +218,7 @@ static void pci_find_function(unsigned bus, unsigned dev, unsigned fun)
     printf("  %02x:%02x.%x \"%s\": \"%s\" (%s: %s, rev: %02hhx)\n",
            bus, dev, fun, vendor_name, device_name, baseclass_name, subclass_name, class.revision_id);
 
+    /* cppcheck-suppress memleakOnRealloc */
     known_pci_devices = realloc(known_pci_devices, sizeof (*known_pci_devices) * (num_known_pci_devices + 1));
     struct x86_known_pci_device *d = calloc(1, sizeof *d);
     known_pci_devices[num_known_pci_devices] = d;

cpu/x86/x86_pic.c

@@ -64,7 +64,8 @@ static bool spurious_irq(uint8_t irq_num)
         return (inb(PIC_MASTER + PIC_COMMAND) & (1 << irq_num)) == 0;
     }
 
-    return false; // TODO: does not work
+    return false;
+#if 0 /* TODO: does not work */
     irq_num -= 8;
     outb(PIC_SLAVE + PIC_COMMAND, PIC_READ_ISR);
     if (inb(PIC_SLAVE + PIC_COMMAND) & (1 << irq_num)) {
@@ -72,6 +73,7 @@ static bool spurious_irq(uint8_t irq_num)
         return true;
     }
     return false;
+#endif
 }
 
 static void pic_interrupt_entry(uint8_t intr_num, struct x86_pushad *orig_ctx, unsigned long error_code)

tests/test_float/main.c

@@ -25,11 +25,11 @@
 
 int main(void)
 {
-    double  x = 1234567. / 1024., z;
+    double x = 1234567.0 / 1024.0;
 
     while (1) {
         x += 0.1;
-        z = x - floor(x);
+        double z = x - floor(x);
 
         if (z >= 1) {
             putchar('+');

tests/test_net_if/main.c

@@ -339,27 +339,26 @@ int test_net_if_get_set_hardware_address(int iface, uint16_t addr)
 
 int test_net_if_get_set_pan_id(int iface)
 {
-    int32_t res;
     uint16_t pan_id = 0xabcd;
 
-    if ((res = net_if_get_pan_id(iface + 1)) >= 0) {
+    if (net_if_get_pan_id(iface + 1) >= 0) {
         printf("FAILED: net_if_get_pan_id(%d) not failed\n", iface);
         return 0;
     }
 
-    if ((res = net_if_set_pan_id(iface, pan_id)) < 0) {
+    if (net_if_set_pan_id(iface, pan_id) < 0) {
         printf("FAILED: net_if_set_pan_id(%d, 0x%04x) failed\n", iface, pan_id);
         return 0;
     }
 
 #if MODULE_AT86RF231 || MODULE_CC2420 || MODULE_MC1322X
-
-    if ((res = net_if_get_pan_id(iface)) < 0) {
+    int32_t res = net_if_get_pan_id(iface);
+    if (res < 0) {
         printf("FAILED: net_if_get_pan_id(%d) failed\n", iface);
         return 0;
     }
 
-    pan_id = (uint16_t)res;
+    pan_id = (uint16_t) res;
 #else
     pan_id = 0;
 #endif

tests/test_thread_cooperation/main.c

@@ -37,25 +37,20 @@ void *run(void *arg)
 {
     (void) arg;
 
-    int err;
     int me = thread_getpid();
     printf("I am alive (%d)\n", me);
     msg_t m;
-    err = msg_receive(&m);
+    msg_receive(&m);
     printf("Thread %d has arg %" PRIu32 "\n", me, m.content.value);
 
-    err = mutex_lock(&mtx);
-
-    if (err < 1) {
-        printf("[!!!] mutex_lock failed with %d\n", err);
-    }
+    mutex_lock(&mtx);
 
     storage *= m.content.value;
     mutex_unlock(&mtx);
 
     msg_t final;
     final.content.value = me;
-    err = msg_send(&final, main_id, 1);
+    int err = msg_send(&final, main_id, 1);
 
     if (err < 0) {
         printf("[!!!] Failed to send message from %d to main\n", me);
@@ -66,14 +61,9 @@ void *run(void *arg)
 
 int main(void)
 {
-    int err;
     main_id = thread_getpid();
 
-    err = mutex_init(&mtx);
-
-    if (err < 1) {
-        printf("[!!!] mutex_init failed with %d\n", err);
-    }
+    mutex_init(&mtx);
 
     printf("Problem: %d\n", PROBLEM);
 
@@ -86,12 +76,12 @@ int main(void)
                                run, NULL, "thread");
 
         if (ths[i] < 0)  {
-            printf("[!!!] Creating thread failed with %d\n", err);
+            printf("[!!!] Creating thread failed.\n");
         }
         else {
             args[i].content.value = i + 1;
-            err = msg_send(&args[i], ths[i], 1);
 
+            int err = msg_send(&args[i], ths[i], 1);
             if (err < 0) {
                 printf("[!!!] Sending message to thread %d failed\n", ths[i]);
             }

tests/test_vtimer_msg_diff/main.c

@@ -113,7 +113,7 @@ int main(void)
                   "timer");
 
     for (unsigned i = 0; i < sizeof(timer_msgs)/sizeof(struct timer_msg); i++) {
-        printf("Sending timer msg %d...\n", i);
+        printf("Sending timer msg %u...\n", i);
         m.content.ptr = (char *) &timer_msgs[i];
         msg_send(&m, pid, false);
     }

tests/unittests/embunit/embUnit/TestSuite.c

@@ -42,11 +42,9 @@ char* TestSuite_name(TestSuite* self)
 
 void TestSuite_run(TestSuite* self,TestResult* result)
 {
-	int i;
-	Test* test;
 	if (self->tests) {
-		for (i=0; i<self->numberOfTests; i++) {
-			test = self->tests[i];
+		for (int i = 0; i < self->numberOfTests; i++) {
+			Test* test = self->tests[i];
 			Test_run(test, result);
 		}
 	}
@@ -55,11 +53,9 @@ void TestSuite_run(TestSuite* self,TestResult* result)
 int TestSuite_countTestCases(TestSuite* self)
 {
 	int count = 0;
-	int i;
-	Test* test;
 	if (self->tests) {
-		for (i=0; i<self->numberOfTests; i++) {
-			test = self->tests[i];
+		for (int i = 0; i < self->numberOfTests; i++) {
+			Test* test = self->tests[i];
 			count += Test_countTestCases(test);
 		}
 	}