handle_disable_channel: don't use get_connection_by_scid.

This removes the final user, so we remove it.

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

gossipd/gossip.c

@@ -1810,6 +1810,7 @@ static struct io_plan *handle_disable_channel(struct io_conn *conn,
 	tal_t *tmpctx = tal_tmpctx(msg);
 	struct short_channel_id scid;
 	u8 direction;
+	struct routing_channel *chan;
 	struct node_connection *nc;
 	bool active;
 	u16 flags, cltv_expiry_delta;
@@ -1824,15 +1825,15 @@ static struct io_plan *handle_disable_channel(struct io_conn *conn,
 		goto fail;
 	}
 
-	nc = get_connection_by_scid(daemon->rstate, &scid, direction);
+	chan = get_channel(daemon->rstate, &scid);
-
+	if (!chan || !chan->connections[direction]) {
-	if (!nc) {
 		status_trace(
 		    "Unable to find channel %s/%d",
 		    type_to_string(msg, struct short_channel_id, &scid),
 		    direction);
 		goto fail;
 	}
+	nc = chan->connections[direction];
 
 	status_trace("Disabling channel %s/%d, active %d -> %d",
 		     type_to_string(msg, struct short_channel_id, &scid),

gossipd/routing.c

@@ -196,19 +196,6 @@ static void destroy_routing_channel(struct routing_channel *chan,
 		tal_free(chan->nodes[1]);
 }
 
-/* FIXME: All users of this are confused. */
-struct node_connection *get_connection_by_scid(const struct routing_state *rstate,
-					      const struct short_channel_id *scid,
-					      const u8 direction)
-{
-	struct routing_channel *chan = get_channel(rstate, scid);
-
-	if (chan == NULL)
-		return NULL;
-	else
-		return chan->connections[direction];
-}
-
 static void destroy_node_connection(struct node_connection *nc,
 				    struct routing_channel *chan)
 {

gossipd/routing.h

@@ -188,12 +188,6 @@ struct routing_channel *new_routing_channel(struct routing_state *rstate,
 					    const struct pubkey *id1,
 					    const struct pubkey *id2);
 
-/* Given a short_channel_id, retrieve the matching connection, or NULL if it is
- * unknown. */
-struct node_connection *get_connection_by_scid(const struct routing_state *rstate,
-					       const struct short_channel_id *schanid,
-					      const u8 direction);
-
 /* Handlers for incoming messages */
 
 /**