tools: Mass fixing of empty prototypes (for -Wstrict-prototypes)

examples/system/console/components/cmd_nvs/cmd_nvs.c

@@ -507,7 +507,7 @@ static int list_entries(int argc, char **argv)
     return list(part, name, type);
 }
 
-void register_nvs()
+void register_nvs(void)
 {
     set_args.key = arg_str1(NULL, NULL, "<key>", "key of the value to be set");
     set_args.type = arg_str1(NULL, NULL, "<type>", ARG_TYPE_STR);

examples/system/console/components/cmd_nvs/cmd_nvs.h

@@ -13,7 +13,7 @@ extern "C" {
 #endif
 
 // Register NVS functions
-void register_nvs();
+void register_nvs(void);
 
 #ifdef __cplusplus
 }