plugins/fetchinvoice: fixup ca9557c

avoid use after free

plugins/fetchinvoice.c

@@ -1477,12 +1477,12 @@ static struct command_result *rawrequest_listpeerchannels_done(struct command *c
 							       const jsmntok_t *result,
 							       struct sent *sent)
 {
+	struct pubkey node_id;
 	/* Hack to store node_id from cmd */
-	struct pubkey *node_id = sent->path;
-	sent->path = path_to_node(sent, cmd->plugin, buf, result, node_id);
-	tal_free(node_id);
+	node_id = *sent->path;
+	sent->path = path_to_node(sent, cmd->plugin, buf, result, &node_id);
 	if (!sent->path) {
-		return connect_direct(cmd, node_id,
+		return connect_direct(cmd, &node_id,
 				      sendinvreq_after_connect, sent);
 	}