virtio-ccw: virtio_ccw_set_guest_notifier(): fix failure path

We leak notifier initialization on that failure path. Let's
cleanup it.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
Reviewed-by: Halil Pasic <pasic@linux.ibm.com>
Reviewed-by: Eric Farman <farman@linux.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-ID: <20260119185228.203296-8-vsementsov@yandex-team.ru>
Signed-off-by: Thomas Huth <thuth@redhat.com>

hw/s390x/virtio-ccw.c

@@ -1038,6 +1038,7 @@ static int virtio_ccw_set_guest_notifier(VirtioCcwDevice *dev, int n,
             if (r) {
                 virtio_queue_set_guest_notifier_fd_handler(vq, false,
                                                            with_irqfd);
+                event_notifier_cleanup(notifier);
                 return r;
             }
         }