tcp: remove unused tcp_fin() parameters

tcp_fin() only needs socket pointer, we can remove skb and th params.
Signed-off-by: NEric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/ipv4/tcp_input.c

@@ -4134,7 +4134,7 @@ static void tcp_reset(struct sock *sk)
  *
  *	If we are in FINWAIT-2, a received FIN moves us to TIME-WAIT.
  */
-static void tcp_fin(struct sk_buff *skb, struct sock *sk, struct tcphdr *th)
+static void tcp_fin(struct sock *sk)
 {
 	struct tcp_sock *tp = tcp_sk(sk);
 
@@ -4405,7 +4405,7 @@ static void tcp_ofo_queue(struct sock *sk)
 		__skb_queue_tail(&sk->sk_receive_queue, skb);
 		tp->rcv_nxt = TCP_SKB_CB(skb)->end_seq;
 		if (tcp_hdr(skb)->fin)
-			tcp_fin(skb, sk, tcp_hdr(skb));
+			tcp_fin(sk);
 	}
 }
 
@@ -4487,7 +4487,7 @@ static void tcp_data_queue(struct sock *sk, struct sk_buff *skb)
 		if (skb->len)
 			tcp_event_data_recv(sk, skb);
 		if (th->fin)
-			tcp_fin(skb, sk, th);
+			tcp_fin(sk);
 
 		if (!skb_queue_empty(&tp->out_of_order_queue)) {
 			tcp_ofo_queue(sk);