Do not call sati_check_data_io() for SATI_UNMAP sequences.
Do not call sati_check_data_io() for SATI_UNMAP sequences.

This routine is intended only for commands such as INQUIRY where
the controller may fill out a smaller amount of data than allocated
by the host.

The end result of this bug was that isci(4) would report non-zero
resid for successful SCSI_UNMAP commands.

Sponsored by:	Intel
MFC after:	3 days

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