libvhost-user: add vu_queue_unpop()
vhost-user-input will make use of this function to undo some queue pop in case the virtio queue does not have enough room. Signed-off-by: NMarc-André Lureau <marcandre.lureau@redhat.com> Message-Id: <20190308140454.32437-11-marcandre.lureau@redhat.com> Reviewed-by: NMichael S. Tsirkin <mst@redhat.com> Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>
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