phonet: Use frag list abstraction interfaces.

Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/phonet/pep-gprs.c b/net/phonet/pep-gprs.c
index 851f6a3..480839d 100644
--- a/net/phonet/pep-gprs.c
+++ b/net/phonet/pep-gprs.c
@@ -115,10 +115,10 @@
 		rskb->truesize += rskb->len;
 
 		/* Avoid nested fragments */
-		for (fs = skb_shinfo(skb)->frag_list; fs; fs = fs->next)
+		skb_walk_frags(skb, fs)
 			flen += fs->len;
 		skb->next = skb_shinfo(skb)->frag_list;
-		skb_shinfo(skb)->frag_list = NULL;
+		skb_frag_list_init(skb);
 		skb->len -= flen;
 		skb->data_len -= flen;
 		skb->truesize -= flen;