netfilter: Kill unused copies of RCV_SKB_FAIL

This appears to have been a dead macro in both nfnetlink_log.c and
nfnetlink_queue_core.c since these pieces of code were added in 2005.
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

net/netfilter/nfnetlink_log.c

@@ -598,8 +598,6 @@ __build_packet_message(struct nfnl_log_net *log,
 	return -1;
 }
 
-#define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0)
-
 static struct nf_loginfo default_loginfo = {
 	.type =		NF_LOG_TYPE_ULOG,
 	.u = {

net/netfilter/nfnetlink_queue_core.c

@@ -834,8 +834,6 @@ nfqnl_dev_drop(struct net *net, int ifindex)
 	rcu_read_unlock();
 }
 
-#define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0)
-
 static int
 nfqnl_rcv_dev_event(struct notifier_block *this,
 		    unsigned long event, void *ptr)