6461930 fix for 6342431 can be improved (fix lint)

[nore...@opensolaris.org]

Author: cg149915
Repository: /hg/onnv/onnv-gate
Revision: ff5467950194266e0b24ae4eca5629c6b04d9121
Log message:
6461930 fix for 6342431 can be improved (fix lint)

Files:
        update: usr/src/uts/common/io/scsi/targets/sd.c