mysqld_safe_help - remove warning

/home/travis/build/MariaDB/server/extra/mysqld_safe_helper.c:62:21: warning: too many arguments in call to 'do_usage'
    do_usage(argv[0]);
    ~~~~~~~~        ^
1 warning generated.

extra/mysqld_safe_helper.c

@@ -59,7 +59,7 @@ int main(int argc, char *argv[])
   MY_INIT(argv[0]);
 
   if (argc < 3)
-    do_usage(argv[0]);
+    do_usage();
 
   user_info= my_check_user(argv[1], MYF(0));
   if (user_info ? my_set_user(argv[1], user_info, MYF(MY_WME))