iproute: fix handling of "dev IFACE" selector

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

networking/libiproute/libnetlink.c

@@ -55,6 +55,7 @@ int FAST_FUNC xrtnl_wilddump_request(struct rtnl_handle *rth, int family, int ty
 	return rtnl_send(rth, (void*)&req, sizeof(req));
 }
 
+//TODO: pass rth->fd instead of full rth?
 int FAST_FUNC rtnl_send(struct rtnl_handle *rth, char *buf, int len)
 {
 	struct sockaddr_nl nladdr;