conf: do not free static memory

src/lxc/conf.c

@@ -3242,10 +3242,6 @@ static void lxc_remove_nic(struct lxc_list *it)
 
 	lxc_list_del(it);
 
-	free(netdev->link);
-	free(netdev->name);
-	if (netdev->type == LXC_NET_VETH)
-		free(netdev->priv.veth_attr.pair);
 	free(netdev->upscript);
 	free(netdev->downscript);
 	free(netdev->hwaddr);