[NETFILTER]: nf_conntrack: Removes unused destroy operation of l3proto

Signed-off-by: NYasuyuki Kozakai <yasuyuki.kozakai@toshiba.co.jp>
Signed-off-by: NPatrick McHardy <kaber@trash.net>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

include/net/netfilter/nf_conntrack_l3proto.h

@@ -56,9 +56,6 @@ struct nf_conntrack_l3proto
 	 */
 	int (*new)(struct nf_conn *conntrack, const struct sk_buff *skb);
 
-	/* Called when a conntrack entry is destroyed */
-	void (*destroy)(struct nf_conn *conntrack);
-
 	/*
 	 * Called before tracking. 
 	 *	*dataoff: offset of protocol header (TCP, UDP,...) in *pskb

net/netfilter/nf_conntrack_core.c

@@ -299,7 +299,6 @@ destroy_conntrack(struct nf_conntrack *nfct)
 {
 	struct nf_conn *ct = (struct nf_conn *)nfct;
 	struct nf_conn_help *help = nfct_help(ct);
-	struct nf_conntrack_l3proto *l3proto;
 	struct nf_conntrack_l4proto *l4proto;
 	typeof(nf_conntrack_destroyed) destroyed;
 
@@ -317,10 +316,6 @@ destroy_conntrack(struct nf_conntrack *nfct)
 	 * destroy_conntrack() MUST NOT be called with a write lock
 	 * to nf_conntrack_lock!!! -HW */
 	rcu_read_lock();
-	l3proto = __nf_ct_l3proto_find(ct->tuplehash[IP_CT_DIR_REPLY].tuple.src.l3num);
-	if (l3proto && l3proto->destroy)
-		l3proto->destroy(ct);
-
 	l4proto = __nf_ct_l4proto_find(ct->tuplehash[IP_CT_DIR_REPLY].tuple.src.l3num,
 				       ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.protonum);
 	if (l4proto && l4proto->destroy)