phonet: Protect pipe_do_remove() with appropriate ifdefs.

It is only used when CONFIG_PHONET_PIPECTRLR is not set.
Signed-off-by: David S. Miller <davem@davemloft.net>

net/phonet/pep.c

@@ -849,6 +849,7 @@ static int pep_do_rcv(struct sock *sk, struct sk_buff *skb)
 	return err;
 }
 
+#ifndef CONFIG_PHONET_PIPECTRLR
 static int pipe_do_remove(struct sock *sk)
 {
 	struct pep_sock *pn = pep_sk(sk);
@@ -870,6 +871,7 @@ static int pipe_do_remove(struct sock *sk)
 
 	return pn_skb_send(sk, skb, NULL);
 }
+#endif
 
 /* associated socket ceases to exist */
 static void pep_sock_close(struct sock *sk, long timeout)