lightningd: close a take() leak.

test_routing_gossip (__main__.LightningDTests) ... lightningd: Outstanding taken pointers: lightningd/peer_control.c:2352:towire_errorfmt(ld, ((void *)0), "Can't resolve your address")

This caused by the other end closing due to the next bug.

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

lightningd/peer_control.c

@@ -2348,8 +2348,7 @@ static void peer_accept_channel(struct lightningd *ld,
 
 	/* FIXME: Only happens due to netaddr fail. */
 	if (!peer) {
-		errmsg = take(towire_errorfmt(ld, NULL,
+		errmsg = towire_errorfmt(ld, NULL, "Can't resolve your address");
-					      "Can't resolve your address"));
 		goto peer_to_gossipd;
 	}
 
@@ -2411,6 +2410,7 @@ peer_to_gossipd:
 	subd_send_msg(ld->gossip, take(msg));
 	subd_send_fd(ld->gossip, peer_fd);
 	close(gossip_fd);
+	tal_free(errmsg);
 	return;
 }