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

sys/dev/isci/scil/sati.c

@@ -1095,10 +1095,6 @@ SATI_STATUS sati_translate_command_response(
          status = sati_unmap_translate_response(
                      sequence, scsi_io, ata_io
                   );
-         if(status == SATI_COMPLETE)
-         {
-            status = sati_check_data_io(sequence);
-         }
       break;
 #endif // !defined(DISABLE_SATI_UNMAP)