infiniband: nes: Fix more direct skb list accesses.

The following:

	skb = skb->next;
	...
	if (skb == (struct sk_buff *)queue)

is transformed into:

	skb = skb_peek_next(skb, queue);
	...
	if (!skb)

Signed-off-by: David S. Miller <davem@davemloft.net>