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/[e-mail]
Reviewed-by: Hannes Reinecke <[e-mail]>
Reviewed-by: Bart Van Assche <[e-mail]>
Reviewed-by: Christoph Hellwig <[e-mail]>
Signed-off-by: John Garry <[e-mail]>
Signed-off-by: Martin K. Petersen <[e-mail]>

drivers/scsi/fnic/fnic_scsi.c

···
 	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;