In tcp_v4_send_reset, use inet_sk to get at

ttl of tcp_socket.

net/ipv4/tcp_ipv4.c

@@ -1202,7 +1202,7 @@ static void tcp_v4_send_reset(struct sk_buff *skb)
 	arg.n_iov = 1;
 	arg.csumoffset = offsetof(struct tcphdr, check) / 2; 
 
-	tcp_socket->sk->protinfo.af_inet.ttl = sysctl_ip_default_ttl;
+	inet_sk(tcp_socket->sk)->ttl = sysctl_ip_default_ttl;
 	ip_send_reply(tcp_socket->sk, skb, &arg, sizeof rth);
 
 	TCP_INC_STATS_BH(TcpOutSegs);