[NETFILTER]: nf_queue: remove unused data pointer

Remove the data pointer from struct nf_queue_handler. It has never been used
and is useless for the only handler that really matters, nfnetlink_queue,
since the handler is shared between all instances.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/netfilter/nfnetlink_queue.c b/net/netfilter/nfnetlink_queue.c
index b75091c..94ec1c2 100644
--- a/net/netfilter/nfnetlink_queue.c
+++ b/net/netfilter/nfnetlink_queue.c
@@ -534,7 +534,7 @@
 
 static int
 nfqnl_enqueue_packet(struct sk_buff *skb, struct nf_info *info,
-		     unsigned int queuenum, void *data)
+		     unsigned int queuenum)
 {
 	int status = -EINVAL;
 	struct sk_buff *nskb;