udev: control - add FIXME comment to remove work-around

src/udev/udev-ctrl.c

@@ -92,6 +92,11 @@ struct udev_ctrl *udev_ctrl_new_from_fd(struct udev *udev, int fd) {
                 uctrl->bound = true;
                 uctrl->sock = fd;
         }
+
+        /*
+         * FIXME: remove it as soon as we can depend on this:
+         *   http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=90c6bd34f884cd9cee21f1d152baf6c18bcac949
+         */
         r = setsockopt(uctrl->sock, SOL_SOCKET, SO_PASSCRED, &on, sizeof(on));
         if (r < 0)
                 log_warning_errno(errno, "could not set SO_PASSCRED: %m");