From c9be48dc8bb22f1f6e6ff1560b2b28e925a0b815 Mon Sep 17 00:00:00 2001
From: James Chapman <jchapman@katalix.com>
Date: Tue, 10 Apr 2012 00:10:43 +0000
Subject: [PATCH] l2tp: don't overwrite source address in l2tp_ip_bind()

Applications using L2TP/IP sockets want to be able to bind() an L2TP/IP
socket to set the local tunnel id while leaving the auto-assigned source
address alone. So if no source address is supplied, don't overwrite
the address already stored in the socket.

Signed-off-by: James Chapman <jchapman@katalix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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