tests: don't free after ck_abort_msg as it's marked no-return

Signed-off-by: Yury V. Zaytsev <[email protected]>

tests/lib/mcconfig/config_string.c

@@ -56,7 +56,6 @@ config_object__reopen (void)
     if (!mc_config_save_file (mc_config, &error))
     {
         ck_abort_msg ("Unable to save config file: %s", error->message);
-        g_error_free (error);
     }
 
     mc_config_deinit (mc_config);