tcp: rename struct tcp_request_sock listener

The listener field in struct tcp_request_sock is a pointer
back to the listener. We now have req->rsk_listener, so TCP
only needs one boolean and not a full pointer.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv6/syncookies.c b/net/ipv6/syncookies.c
index 039e74d..1ef0c926 100644
--- a/net/ipv6/syncookies.c
+++ b/net/ipv6/syncookies.c
@@ -195,7 +195,7 @@
 
 	ireq = inet_rsk(req);
 	treq = tcp_rsk(req);
-	treq->listener = NULL;
+	treq->tfo_listener = false;
 	ireq->ireq_family = AF_INET6;
 
 	if (security_inet_conn_request(sk, skb, req))