scsi: target: Compare explicitly with SAM_STAT_GOOD

Instead of leaving it implicit that SAM_STAT_GOOD == 0, compare explicitly
with SAM_STAT_GOOD.

Link: https://lore.kernel.org/r/20210415220826.29438-18-bvanassche@acm.org


Reviewed-by: Mike Christie <michael.christie@oracle.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>