gossipd: fix take leak when peer is dying.

In this case, local and remote are *both* NULL; so if someone tries to
send a packet with take(), we need to free it.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

gossipd/gossip.c

@@ -506,6 +506,9 @@ static void queue_peer_msg(struct peer *peer, const u8 *msg TAKES)
 		if (taken(msg))
 			tal_free(msg);
 		daemon_conn_send(peer->remote, take(send));
+	} else { /* Waiting to die. */
+		if (taken(msg))
+			tal_free(msg);
 	}
 }