gossip: Add desctructor to gossip_store

Signed-off-by: Christian Decker <decker.christian@gmail.com>

gossipd/gossip_store.c

@@ -16,6 +16,13 @@ struct gossip_store {
 	__off_t replaysize;
 };
 
+static void gossip_store_destroy(struct gossip_store *gs)
+{
+	if (gs->read_fd != -1)
+		close(gs->read_fd);
+	close(gs->write_fd);
+}
+
 struct gossip_store *gossip_store_new(const tal_t *ctx)
 {
 	struct gossip_store *gs = tal(ctx, struct gossip_store);
@@ -23,6 +30,8 @@ struct gossip_store *gossip_store_new(const tal_t *ctx)
 	gs->read_fd = open(GOSSIP_STORE_FILENAME, O_RDONLY);
 	gs->replaysize = lseek(gs->write_fd, 0, SEEK_END);
 
+	tal_add_destructor(gs, gossip_store_destroy);
+
 	return gs;
 }