scsi: fnic: Stop setting scsi_cmnd.tag

It is never read. Setting it and the request tag seems dodgy anyway.

Link: https://lore.kernel.org/r/1628862553-179450-3-git-send-email-john.garry@huawei.com
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: John Garry <john.garry@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/fnic/fnic_scsi.c

@@ -2213,7 +2213,7 @@ fnic_scsi_host_start_tag(struct fnic *fnic, struct scsi_cmnd *sc)
 	if (IS_ERR(dummy))
 		return SCSI_NO_TAG;
 
-	sc->tag = rq->tag = dummy->tag;
+	rq->tag = dummy->tag;
 	sc->host_scribble = (unsigned char *)dummy;
 
 	return dummy->tag;