scsi: fnic: vnic_rq_clean change BUG_ON to WARN_ON

rq->ctrl not enabled when this is called is bad but not fatal and can
continue.
Signed-off-by: NSatish Kharat <satishkh@cisco.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/fnic/vnic_rq.c

@@ -171,7 +171,7 @@ void vnic_rq_clean(struct vnic_rq *rq,
 	struct vnic_rq_buf *buf;
 	u32 fetch_index;
 
-	BUG_ON(ioread32(&rq->ctrl->enable));
+	WARN_ON(ioread32(&rq->ctrl->enable));
 
 	buf = rq->to_clean;