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_core.c b/net/l2tp/l2tp_core.c
index 98dfcce..ecc7aea 100644
--- a/net/l2tp/l2tp_core.c
+++ b/net/l2tp/l2tp_core.c
@@ -954,7 +954,8 @@
 	}
 
 	/* Queue the packet to IP for output */
-	error = ip_queue_xmit(skb, 1);
+	skb->local_df = 1;
+	error = ip_queue_xmit(skb);
 
 	/* Update stats */
 	if (error >= 0) {