[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/bridge/br.c b/net/bridge/br.c
index 848b8fa..93867bb 100644
--- a/net/bridge/br.c
+++ b/net/bridge/br.c
@@ -23,7 +23,7 @@
 
 #include "br_private.h"
 
-int (*br_should_route_hook) (struct sk_buff **pskb) = NULL;
+int (*br_should_route_hook)(struct sk_buff *skb);
 
 static struct llc_sap *br_stp_sap;