scsi: advansys: remove unused variable 'srb_tag' in adv_isr_callback

drivers/scsi/advansys.c: In function 'adv_isr_callback':
drivers/scsi/advansys.c:5952:6: warning:
 variable 'srb_tag' set but not used [-Wunused-but-set-variable]

It never used since introduction in
commit 9c17c62a ("advansys: use shared host tag map for command lookup")
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/advansys.c

@@ -5949,7 +5949,6 @@ static void adv_async_callback(ADV_DVC_VAR *adv_dvc_varp, uchar code)
 static void adv_isr_callback(ADV_DVC_VAR *adv_dvc_varp, ADV_SCSI_REQ_Q *scsiqp)
 {
 	struct asc_board *boardp = adv_dvc_varp->drv_ptr;
-	u32 srb_tag;
 	adv_req_t *reqp;
 	adv_sgblk_t *sgblkp;
 	struct scsi_cmnd *scp;
@@ -5965,7 +5964,6 @@ static void adv_isr_callback(ADV_DVC_VAR *adv_dvc_varp, ADV_SCSI_REQ_Q *scsiqp)
 	 * completed. The adv_req_t structure actually contains the
 	 * completed ADV_SCSI_REQ_Q structure.
 	 */
-	srb_tag = le32_to_cpu(scsiqp->srb_tag);
 	scp = scsi_host_find_tag(boardp->shost, scsiqp->srb_tag);
 
 	ASC_DBG(1, "scp 0x%p\n", scp);