ipvs: use nf_ct_kill helper

Once timer is removed from nf_conn struct we cannot open-code
the removal sequence anymore.
Signed-off-by: Florian Westphal <fw@strlen.de>
Acked-by: Julian Anastasov <ja@ssi.bg>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

net/netfilter/ipvs/ip_vs_nfct.c

@@ -281,13 +281,10 @@ void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp)
 	h = nf_conntrack_find_get(cp->ipvs->net, &nf_ct_zone_dflt, &tuple);
 	if (h) {
 		ct = nf_ct_tuplehash_to_ctrack(h);
-		/* Show what happens instead of calling nf_ct_kill() */
-		if (del_timer(&ct->timeout)) {
-			IP_VS_DBG(7, "%s: ct=%p, deleted conntrack timer for tuple="
+		if (nf_ct_kill(ct)) {
+			IP_VS_DBG(7, "%s: ct=%p, deleted conntrack for tuple="
 				FMT_TUPLE "\n",
 				__func__, ct, ARG_TUPLE(&tuple));
-			if (ct->timeout.function)
-				ct->timeout.function(ct->timeout.data);
 		} else {
 			IP_VS_DBG(7, "%s: ct=%p, no conntrack timer for tuple="
 				FMT_TUPLE "\n",