net: replace ipfragok with skb->local_df

As Herbert Xu said: we should be able to simply replace ipfragok
with skb->local_df. commit f88037(sctp: Drop ipfargok in sctp_xmit function)
has droped ipfragok and set local_df value properly.

The patch kills the ipfragok parameter of .queue_xmit().

Signed-off-by: Shan Wei <shanwei@cn.fujitsu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/l2tp/l2tp_ip.c b/net/l2tp/l2tp_ip.c
index 75bf784..0852512 100644
--- a/net/l2tp/l2tp_ip.c
+++ b/net/l2tp/l2tp_ip.c
@@ -501,7 +501,7 @@
 	skb_dst_set(skb, dst_clone(&rt->u.dst));
 
 	/* Queue the packet to IP for output */
-	rc = ip_queue_xmit(skb, 0);
+	rc = ip_queue_xmit(skb);
 
 error:
 	/* Update stats */