block/backup: drop unused synchronization interface
Signed-off-by: NVladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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Signed-off-by: NVladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>