scsi: sym53c8xx: Use scsi_cmd_to_rq() instead of scsi_cmnd.request

Prepare for removal of the request pointer by using scsi_cmd_to_rq()
instead. This patch does not change any functionality.

Link: https://lore.kernel.org/r/20210809230355.8186-47-bvanassche@acm.org
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/sym53c8xx_2/sym_glue.c

@@ -500,8 +500,8 @@ static int sym53c8xx_queue_command_lck(struct scsi_cmnd *cmd,
 	 *  Shorten our settle_time if needed for 
 	 *  this command not to time out.
 	 */
-	if (np->s.settle_time_valid && cmd->request->timeout) {
-		unsigned long tlimit = jiffies + cmd->request->timeout;
+	if (np->s.settle_time_valid && scsi_cmd_to_rq(cmd)->timeout) {
+		unsigned long tlimit = jiffies + scsi_cmd_to_rq(cmd)->timeout;
 		tlimit -= SYM_CONF_TIMER_INTERVAL*2;
 		if (time_after(np->s.settle_time, tlimit)) {
 			np->s.settle_time = tlimit;