phonet: remove the unused variable pn

Signed-off-by: NChangli Gao <xiaosuo@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/phonet/pep.c

@@ -300,7 +300,6 @@ static int pipe_handler_send_ind(struct sock *sk, u8 utid, u8 msg_id)
 
 static int pipe_handler_enable_pipe(struct sock *sk, int enable)
 {
-	struct pep_sock *pn = pep_sk(sk);
 	int utid, req;
 
 	if (enable) {