vhost: release virtqueue objects in error path

vhost_dev_start function does not release virtqueue objects when
event_notifier_init() function fails. Release virtqueue objects
and log a message about function failure.

Signed-off-by: Prasad Pandit <pjp@fedoraproject.org>
Message-Id: <20230529114333.31686-3-ppandit@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Fixes: f9a09ca ("vhost: add support for configure interrupt")
Reviewed-by: Peter Xu <peterx@redhat.com>
Cc: qemu-stable@nongnu.org
Acked-by: Jason Wang <jasowang@redhat.com>

hw/virtio/vhost.c

@@ -1941,7 +1941,8 @@ int vhost_dev_start(struct vhost_dev *hdev, VirtIODevice *vdev, bool vrings)
     r = event_notifier_init(
         &hdev->vqs[VHOST_QUEUE_NUM_CONFIG_INR].masked_config_notifier, 0);
     if (r < 0) {
-        return r;
+        VHOST_OPS_DEBUG(r, "event_notifier_init failed");
+        goto fail_vq;
     }
     event_notifier_test_and_clear(
         &hdev->vqs[VHOST_QUEUE_NUM_CONFIG_INR].masked_config_notifier);