Fix minor fallout from patch 6/8.

[NETLINK]: Fixed failed BUG_TRAP

I forgot to set groups to NULL after freeing it:
KERNEL: assertion (!nlk_sk(sk)->groups) failed at net/netlink/af_netlink.c (146)

Signed-off-by: Patrick McHardy <[EMAIL PROTECTED]>

---
commit 1018286a3c3542c9926e287811a24bf85e1b6e9e
tree cb5781693d9737aa85679af9befbd68f04f84c5d
parent 5719d60b114683e7c1bf1aa9a553efb641184e1b
author Patrick McHardy <[EMAIL PROTECTED]> Mon, 15 Aug 2005 00:49:35 +0200
committer Patrick McHardy <[EMAIL PROTECTED]> Mon, 15 Aug 2005 00:49:35 +0200

 net/netlink/af_netlink.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -472,6 +472,8 @@ static int netlink_release(struct socket
 	}
 
 	kfree(nlk->groups);
+	nlk->groups = NULL;
+
 	sock_put(sk);
 	return 0;
 }

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