Without it its not guaranteed that no .queue_rq is inflight.
Reviewed-by: NMing Lei <ming.lei@redhat.com>
Acked-by: NMichael S. Tsirkin <mst@redhat.com>
Cc: virtio-dev@lists.oasis-open.org
Cc: Jason Wang <jasowang@redhat.com>
Signed-off-by: NSagi Grimberg <sagi@grimberg.me>