[NETFILTER]: Replace sk_buff ** with sk_buff *

With all the users of the double pointers removed, this patch mops up by
finally replacing all occurances of sk_buff ** in the netfilter API by
sk_buff *.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/netfilter/xt_TRACE.c b/net/netfilter/xt_TRACE.c
index 4df2ded..26c5d08 100644
--- a/net/netfilter/xt_TRACE.c
+++ b/net/netfilter/xt_TRACE.c
@@ -10,14 +10,14 @@
 MODULE_ALIAS("ip6t_TRACE");
 
 static unsigned int
-target(struct sk_buff **pskb,
+target(struct sk_buff *skb,
        const struct net_device *in,
        const struct net_device *out,
        unsigned int hooknum,
        const struct xt_target *target,
        const void *targinfo)
 {
-	(*pskb)->nf_trace = 1;
+	skb->nf_trace = 1;
 	return XT_CONTINUE;
 }