[DCCP]: Move dccp_[un]hash from ipv4.c to the core

As this is used by both ipv4 and ipv6 and is not ipv4 specific.

Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/dccp/ipv6.c b/net/dccp/ipv6.c
index 84651bc..904967b 100644
--- a/net/dccp/ipv6.c
+++ b/net/dccp/ipv6.c
@@ -53,7 +53,7 @@
 {
 	if (sk->sk_state != DCCP_CLOSED) {
 		if (inet_csk(sk)->icsk_af_ops == &dccp_ipv6_mapped) {
-			dccp_prot.hash(sk);
+			dccp_hash(sk);
 			return;
 		}
 		local_bh_disable();