[SCSI] qla2xxx: Revert "qla2xxx: Validate mid-layer 'underflow' during check-condition handling."

This reverts commit 8084fe16

.
The midlayer should be given the oppotunity to interpret the
check-condition and based on scsi_cmnd->resid determine if a
transfer should be retried or failed.

Signed-off-by: Andrew Vasquez <andrew.vasquez@qlogic.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>