Return immediately in save_phys_nics if not run as root

src/lxc/start.c

@@ -856,6 +856,10 @@ out_warn_father:
 static int save_phys_nics(struct lxc_conf *conf)
 {
 	struct lxc_list *iterator;
+	int am_root = (getuid() == 0);
+
+	if (!am_root)
+		return 0;
 		
 	lxc_list_for_each(iterator, &conf->network) {
 		struct lxc_netdev *netdev = iterator->elem;