Bug#15960005 VALGRIND WARNINGS IN PROCESS_ARGS

Both <width> and <precision> can be specified as numbers or '*'.
  If an asterisk is used, an argument of type int is consumed.

include/mysql/service_my_snprintf.h

@@ -49,6 +49,7 @@
         string will be quoted according to MySQL identifier quoting rules.
 
   Both <width> and <precision> can be specified as numbers or '*'.
+  If an asterisk is used, an argument of type int is consumed.
 
   <length modifier> can be 'l', 'll', or 'z'.
 

strings/my_vsnprintf.c

@@ -343,6 +343,7 @@ start:
     print_arr[idx].length--;    
     DBUG_ASSERT(*fmt == '$' && print_arr[idx].length < MAX_ARGS);
     args_arr[print_arr[idx].length].arg_type= 'd';
+    args_arr[print_arr[idx].length].have_longlong= 0;
     print_arr[idx].flags|= LENGTH_ARG;
     arg_count= max(arg_count, print_arr[idx].length + 1);
     fmt++;
@@ -361,6 +362,7 @@ start:
       print_arr[idx].width--;
       DBUG_ASSERT(*fmt == '$' && print_arr[idx].width < MAX_ARGS);
       args_arr[print_arr[idx].width].arg_type= 'd';
+      args_arr[print_arr[idx].width].have_longlong= 0;
       print_arr[idx].flags|= WIDTH_ARG;
       arg_count= max(arg_count, print_arr[idx].width + 1);
       fmt++;