tcp: Fix slab corruption with ipv6 and tcp6fuzz

From: Evgeniy Polyakov <johnpol@2ka.mipt.ru>

This fixes a regression added by ec3c0982
("[TCP]: TCP_DEFER_ACCEPT updates - process as established")

tcp_v6_do_rcv()->tcp_rcv_established(), the latter goes to step5, where
eventually skb can be freed via tcp_data_queue() (drop: label), then if
check for tcp_defer_accept_check() returns true and thus
tcp_rcv_established() returns -1, which forces tcp_v6_do_rcv() to jump
to reset: label, which in turn will pass through discard: label and free
the same skb again.

Tested by Eric Sesterhenn.
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-By: Patrick McManus <mcmanus@ducksong.com>

net/ipv4/tcp_input.c

@@ -4925,8 +4925,7 @@ step5:
 	tcp_data_snd_check(sk);
 	tcp_ack_snd_check(sk);
 
-	if (tcp_defer_accept_check(sk))
-		return -1;
+	tcp_defer_accept_check(sk);
 	return 0;
 
 csum_error: