main: Fix a format string error

src/ostadmin/ot-admin-main.c

@@ -75,7 +75,7 @@ prep_builtin_argv (const char *builtin,
 static void
 set_error_print_usage (GError **error, OtAdminBuiltin *builtins, const char *msg, char **argv)
 {
-  g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED, msg);
+  g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_FAILED, msg);
   usage (argv, builtins, TRUE);
 }