plugins: fix memory leak

plugins/sim_hardcoded.c

@@ -361,9 +361,11 @@ try_aka:
 		sim->aka_supported = 1;
 	}
 end:
+	l_settings_free(key_settings);
+
 	if (!sim->sim_supported && !sim->aka_supported) {
 		l_debug("error parsing config file, values missing");
-		l_settings_free(key_settings);
+
 		return -EINVAL;
 	}