Go on removing printf arguments warnings, add a suppression file to be used with cppcheck command

common/utils/backtrace.c

@@ -31,18 +31,18 @@
 #include "backtrace.h"
 
 /* Obtain a backtrace and print it to stdout. */
-void display_backtrace(void)
-{
+void display_backtrace(void) {
   void *array[10];
   size_t size;
   char **strings;
   size_t i;
-  char* test=getenv("NO_BACKTRACE");
-  if (test!=0) *((int*)0)=0;
+  char *test=getenv("NO_BACKTRACE");
+
+  if (test!=0) *((int *)0)=0;
+
   size = backtrace(array, 10);
   strings = backtrace_symbols(array, size);
-
-  printf("Obtained %zd stack frames.\n", size);
+  printf("Obtained %u stack frames.\n", (unsigned int)size);
 
   for (i = 0; i < size; i++)
     printf("%s\n", strings[i]);
@@ -50,8 +50,7 @@ void display_backtrace(void)
   free(strings);
 }
 
-void backtrace_handle_signal(siginfo_t *info)
-{
+void backtrace_handle_signal(siginfo_t *info) {
   display_backtrace();
   //exit(EXIT_FAILURE);
 }