scsi: snic: Remove unused 'xfer_len' variable

clang with W=1 reports:

drivers/scsi/snic/snic_scsi.c:490:6: error: variable
'xfer_len' set but not used [-Werror,-Wunused-but-set-variable]
u64 xfer_len = 0;
^
This variable is not used so remove it.

Signed-off-by: Tom Rix <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Martin K. Petersen <[e-mail]>

drivers/scsi/snic/snic_scsi.c

···
 			       struct scsi_cmnd *sc)
 {
 	u8 scsi_stat = icmnd_cmpl->scsi_status;
-	u64 xfer_len = 0;
 	int ret = 0;
 
 	/* Mark the IO as complete */
···
 	if (likely(cmpl_stat == SNIC_STAT_IO_SUCCESS)) {
 		sc->result = (DID_OK << 16) | scsi_stat;
 
-		xfer_len = scsi_bufflen(sc);
-
 		/* Update SCSI Cmd with resid value */
 		scsi_set_resid(sc, le32_to_cpu(icmnd_cmpl->resid));
 
-		if (icmnd_cmpl->flags & SNIC_ICMND_CMPL_UNDR_RUN) {
-			xfer_len -= le32_to_cpu(icmnd_cmpl->resid);
+		if (icmnd_cmpl->flags & SNIC_ICMND_CMPL_UNDR_RUN)
 			atomic64_inc(&snic->s_stats.misc.io_under_run);
-		}
 
 		if (icmnd_cmpl->scsi_status == SAM_STAT_TASK_SET_FULL)
 			atomic64_inc(&snic->s_stats.misc.qfull);