nf_nat: fix memset error

This patch fixes an incorrect memset in the NAT code, causing
misbehaviour when unloading and reloading the NAT module.
Applies to stable-2.6.22 and stable-2.6.23.

Please apply, thanks.
[NETFILTER]: nf_nat: fix memset error

Upstream commit e0bf9cf1

The size passing to memset is the size of a pointer. Fixes
misbehaviour when unloading and reloading the NAT module.
Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

net/ipv4/netfilter/nf_nat_core.c

@@ -681,7 +681,7 @@ static int clean_nat(struct nf_conn *i, void *data)
 
 	if (!nat)
 		return 0;
-	memset(nat, 0, sizeof(nat));
+	memset(nat, 0, sizeof(*nat));
 	i->status &= ~(IPS_NAT_MASK | IPS_NAT_DONE_MASK | IPS_SEQ_ADJUST);
 	return 0;
 }