nf_ct_helper_expectfn_unregister
void nf_ct_helper_expectfn_unregister(struct nf_ct_helper_expectfn *n);
nf_ct_helper_expectfn_unregister(&q931_nat);
nf_ct_helper_expectfn_unregister(&callforwarding_nat);
EXPORT_SYMBOL_GPL(nf_ct_helper_expectfn_unregister);
nf_ct_helper_expectfn_unregister(&follow_master_nat);
nf_ct_helper_expectfn_unregister(&follow_master_nat);
nf_ct_helper_expectfn_unregister(&sip_nat);