scsi: scsi_debug: Remove a set-but-not-used variable

This patch avoids that gcc reports the following warning when
building with W=1:

drivers/scsi/scsi_debug.c:2264:15: warning: variable ?pcontrol? set but not used [-Wunused-but-set-variable]
Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Cc: Douglas Gilbert <dgilbert@interlog.com>
Cc: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/scsi_debug.c

@@ -2261,7 +2261,7 @@ static int resp_ie_l_pg(unsigned char * arr)
 static int resp_log_sense(struct scsi_cmnd * scp,
                           struct sdebug_dev_info * devip)
 {
-	int ppc, sp, pcontrol, pcode, subpcode, alloc_len, len, n;
+	int ppc, sp, pcode, subpcode, alloc_len, len, n;
 	unsigned char arr[SDEBUG_MAX_LSENSE_SZ];
 	unsigned char *cmd = scp->cmnd;
 
@@ -2272,7 +2272,6 @@ static int resp_log_sense(struct scsi_cmnd * scp,
 		mk_sense_invalid_fld(scp, SDEB_IN_CDB, 1, ppc ? 1 : 0);
 		return check_condition_result;
 	}
-	pcontrol = (cmd[2] & 0xc0) >> 6;
 	pcode = cmd[2] & 0x3f;
 	subpcode = cmd[3] & 0xff;
 	alloc_len = get_unaligned_be16(cmd + 7);