scsi: qedi: Remove redundant NULL check

kfree_skb() handles a NULL skb argument so the additional check is
unnecessary. Remove it.

Link: https://lore.kernel.org/r/20200827092606.32148-1-vulab@iscas.ac.cnSigned-off-by: Xu Wang <vulab@iscas.ac.cn>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/qedi/qedi_main.c

@@ -789,8 +789,7 @@ static void qedi_ll2_free_skbs(struct qedi_ctx *qedi)
 	spin_lock_bh(&qedi->ll2_lock);
 	list_for_each_entry_safe(work, work_tmp, &qedi->ll2_skb_list, list) {
 		list_del(&work->list);
-		if (work->skb)
-			kfree_skb(work->skb);
+		kfree_skb(work->skb);
 		kfree(work);
 	}
 	spin_unlock_bh(&qedi->ll2_lock);