This patch drops the 'x-' prefix from x-blockdev-reopen.

Signed-off-by: Alberto Garcia <berto@igalia.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-Id: <20210708114709.206487-7-kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>