qcow2: use Z_OK instead of 0 for deflateInit2 return code check
Use appropriate macro, corresponding to deflateInit2 spec. Signed-off-by: NVladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Reviewed-by: NAlberto Garcia <berto@igalia.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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