[TCP]: Kill unused extern decl for tcp_v4_hash_connecting()

Noticed by Alan Menegotto.

Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/tcp.h b/include/net/tcp.h
index 9418f4d..3c989db 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -405,9 +405,6 @@
 
 extern void			tcp_unhash(struct sock *sk);
 
-extern int			tcp_v4_hash_connecting(struct sock *sk);
-
-
 /* From syncookies.c */
 extern struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb, 
 				    struct ip_options *opt);