tcp: add init_seq method to tcp_request_sock_ops

More work in preparation of unifying tcp_v4_conn_request and
tcp_v6_conn_request: indirect the init sequence calls via the
tcp_request_sock_ops.

Signed-off-by: Octavian Purdila <octavian.purdila@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 91b8a2e..2fd886f 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -775,6 +775,7 @@
 	.cookie_init_seq =	cookie_v6_init_sequence,
 #endif
 	.route_req	=	tcp_v6_route_req,
+	.init_seq	=	tcp_v6_init_sequence,
 };
 
 static void tcp_v6_send_response(struct sk_buff *skb, u32 seq, u32 ack, u32 win,
@@ -1114,7 +1115,7 @@
 			goto drop_and_release;
 		}
 
-		isn = tcp_v6_init_sequence(skb);
+		isn = af_ops->init_seq(skb);
 	}
 
 	if (!dst) {