netfilter: use sk_fullsock() helper

Upcoming request sockets have TCP_NEW_SYN_RECV state and should
be special cased a bit like TCP_TIME_WAIT sockets.

Signed-off-by; Eric Dumazet <edumazet@google.com>

Signed-off-by: David S. Miller <davem@davemloft.net>

diff --cc net/netfilter/ipvs/ip_vs_xmit.c
Simple merge

diff --cc net/netfilter/nf_log_common.c
Simple merge

diff --cc net/netfilter/nfnetlink_log.c
Simple merge

diff --cc net/netfilter/nfnetlink_queue_core.c
Simple merge

diff --cc net/netfilter/nft_meta.c
Simple merge