confile_utils: delete netdev from list

src/lxc/confile_utils.c

@@ -477,7 +477,8 @@ void lxc_free_networks(struct lxc_list *networks)
 
 	lxc_list_for_each_safe (cur, networks, next) {
 		struct lxc_netdev *netdev = cur->elem;
-		netdev = cur->elem;
+
+		lxc_list_del(cur);
 		lxc_free_netdev(netdev);
 	}