gossipd: use htable_count() rather than reaching into htable struct.

Now ccan/htable provides the helper, let's use it.

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

gossipd/gossipd.c

@@ -2677,13 +2677,13 @@ static struct io_plan *getnodes(struct io_conn *conn, struct daemon *daemon,
 		struct node_map_iter it;
 		size_t i = 0;
 		node_arr = tal_arr(tmpctx, struct gossip_getnodes_entry,
-				   daemon->rstate->nodes->raw.elems);
+				   node_map_count(daemon->rstate->nodes));
 		n = node_map_first(daemon->rstate->nodes, &it);
 		while (n != NULL) {
 			add_node_entry(node_arr, daemon, n, &node_arr[i++]);
 			n = node_map_next(daemon->rstate->nodes, &it);
 		}
-		assert(i == daemon->rstate->nodes->raw.elems);
+		assert(i == node_map_count(daemon->rstate->nodes));
 	}
 
 	/* FIXME: towire wants array of pointers. */

gossipd/routing.c

@@ -320,8 +320,7 @@ static void remove_chan_from_node(struct routing_state *rstate,
 	} else {
 		if (!chan_map_del(&node->chans.map, chan))
 			abort();
-		/* FIXME: Expose this in ccan/htable */
-		num_chans = node->chans.map.raw.elems;
+		num_chans = chan_map_count(&node->chans.map);
 	}
 
 	/* Last channel?  Simply delete node (and associated announce) */