From 8d8a51e26a6d415e1470759f2cf5f3ee3ee86196 Mon Sep 17 00:00:00 2001
From: "David S. Miller" <davem@davemloft.net>
Date: Tue, 8 Oct 2013 15:44:26 -0400
Subject: [PATCH] l2tp: Fix build warning with ipv6 disabled.
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net/l2tp/l2tp_core.c: In function ‘l2tp_verify_udp_checksum’:
net/l2tp/l2tp_core.c:499:22: warning: unused variable ‘tunnel’ [-Wunused-variable]

Create a helper "l2tp_tunnel()" to facilitate this, and as a side
effect get rid of a bunch of unnecessary void pointer casts.

Signed-off-by: David S. Miller <davem@davemloft.net>
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Reading git-format-patch failed