added a few tweaks to further remove the need to memory
allocation resizing by preallocating the right buffer size.
Signed-off-by: Peter Lieven <pl@kamp.de>
If BYTCHK is false the target will perform a medium check of the indicated
LBAs only and not compare with anything out of the DATA-OUT buffers.
As such we dont need to/should not transfer any DAT-OUT to the target.
