[NETFILTER]: make ipt_helper depend on ipt_conntrack again

Signed-off-by: Patrick McHardy <kaber@trash.net>

net/ipv4/netfilter/ip_conntrack_standalone.c

@@ -871,7 +871,6 @@ EXPORT_SYMBOL(ip_conntrack_protocol_unregister);
 EXPORT_SYMBOL(invert_tuplepr);
 EXPORT_SYMBOL(ip_conntrack_alter_reply);
 EXPORT_SYMBOL(ip_conntrack_destroyed);
-EXPORT_SYMBOL(ip_conntrack_get);
 EXPORT_SYMBOL(need_ip_conntrack);
 EXPORT_SYMBOL(ip_conntrack_helper_register);
 EXPORT_SYMBOL(ip_conntrack_helper_unregister);

net/ipv4/netfilter/ipt_helper.c

@@ -107,6 +107,7 @@ static struct ipt_match helper_match = {
 
 static int __init init(void)
 {
+	need_ip_conntrack();
 	return ipt_register_match(&helper_match);
 }