From 38db9e1db1c91c953b2a539130257ce91533c9f6 Mon Sep 17 00:00:00 2001
From: Julia Lawall <julia@diku.dk>
Date: Fri, 28 Jan 2011 05:43:40 +0000
Subject: [PATCH] include/net/genetlink.h: Allow genlmsg_cancel to accept a
 NULL argument

nlmsg_cancel can accept NULL as its second argument, so for similarity,
this patch extends genlmsg_cancel to be able to accept a NULL second
argument as well.

Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: David S. Miller <davem@davemloft.net>
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