ipv4: Remove unused declaration from include/net/tcp.h.

- The tcp_unhash() method in /include/net/tcp.h is no more needed, as the
unhash method in tcp_prot structure is now inet_unhash (instead of
tcp_unhash in the
past); see tcp_prot structure in net/ipv4/tcp_ipv4.c.

- So, this patch removes tcp_unhash() declaration from include/net/tcp.h

Signed-off-by: Rami Rosen <ramirose@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/tcp.h b/include/net/tcp.h
index 633147c..d448310 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -433,7 +433,6 @@
 
 extern int			tcp_disconnect(struct sock *sk, int flags);
 
-extern void			tcp_unhash(struct sock *sk);
 
 /* From syncookies.c */
 extern __u32 syncookie_secret[2][16-4+SHA_DIGEST_WORDS];