[PATCH 0/1] target: Unmap fixes

[Mike Christie <michael.christie@xxxxxxxxxx>]

This patch made over Linus's tree fixes a crash hit when we get a
WRITE SAME with the NDOB bit set or if the initiator has sent a malformed
WRITE SAME that does not contain any data out buffer even though NDOB=0.

V2:
- This version of patch only fixes the crash. It does not implement
support. Plus other non fix patches put into a feature patchset.