xwayland: close pipe fds on set_cloexec() error

xwayland/server.c

@@ -358,6 +358,8 @@ static bool server_start(struct wlr_xwayland_server *server) {
 	}
 	if (!set_cloexec(notify_fd[0], true)) {
 		wlr_log(WLR_ERROR, "Failed to set CLOEXEC on FD");
+		close(notify_fd[0]);
+		close(notify_fd[1]);
 		server_finish_process(server);
 		return false;
 	}