infiniband: nes: Use skb_peek_next() and skb_queue_walk().

Instead of direct SKB list accesses.
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/infiniband/hw/nes/nes_mgt.c

@@ -198,9 +198,9 @@ static struct sk_buff *nes_get_next_skb(struct nes_device *nesdev, struct nes_qp
 
 	if (skb) {
 		/* Continue processing fpdu */
-		if (skb->next == (struct sk_buff *)&nesqp->pau_list)
+		skb = skb_peek_next(skb, &nesqp->pau_list);
+		if (!skb)
 			goto out;
-		skb = skb->next;
 		processacks = false;
 	} else {
 		/* Starting a new one */
@@ -553,12 +553,10 @@ static void queue_fpdus(struct sk_buff *skb, struct nes_vnic *nesvnic, struct ne
 	if (skb_queue_len(&nesqp->pau_list) == 0) {
 		skb_queue_head(&nesqp->pau_list, skb);
 	} else {
-		tmpskb = nesqp->pau_list.next;
-		while (tmpskb != (struct sk_buff *)&nesqp->pau_list) {
+		skb_queue_walk(&nesqp->pau_list, tmpskb) {
 			cb = (struct nes_rskb_cb *)&tmpskb->cb[0];
 			if (before(seqnum, cb->seqnum))
 				break;
-			tmpskb = tmpskb->next;
 		}
 		skb_insert(tmpskb, skb, &nesqp->pau_list);
 	}