[NETFILTER]: Remove no longer needed symbol exports.

Rusty removed ip_nat_helper_{register,unregister} and
{__,}ip_nat_find_helper but left the symbol exports in
by mistake.
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv4/netfilter/ip_nat_standalone.c

@@ -368,13 +368,9 @@ module_exit(fini);
 EXPORT_SYMBOL(ip_nat_setup_info);
 EXPORT_SYMBOL(ip_nat_protocol_register);
 EXPORT_SYMBOL(ip_nat_protocol_unregister);
-EXPORT_SYMBOL(ip_nat_helper_register);
-EXPORT_SYMBOL(ip_nat_helper_unregister);
 EXPORT_SYMBOL(ip_nat_cheat_check);
 EXPORT_SYMBOL(ip_nat_mangle_tcp_packet);
 EXPORT_SYMBOL(ip_nat_mangle_udp_packet);
 EXPORT_SYMBOL(ip_nat_used_tuple);
-EXPORT_SYMBOL(ip_nat_find_helper);
-EXPORT_SYMBOL(__ip_nat_find_helper);
 EXPORT_SYMBOL(ip_nat_follow_master);
 MODULE_LICENSE("GPL");