Hi Yi-Hung,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on nf-next/master]
[also build test ERROR on v5.1-rc1 next-20190322]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Yi-Hung-Wei/netfilter-Export-nf_ct_-set-destroy-_timeout/20190323-195349
base:   https://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-next.git master
config: x86_64-randconfig-b0-03232323 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   net/netfilter/xt_CT.o: In function `xt_ct_tg_destroy':
>> net/netfilter/xt_CT.c:283: undefined reference to `nf_ct_destroy_timeout'

vim +283 net/netfilter/xt_CT.c

   269	
   270	static void xt_ct_tg_destroy(const struct xt_tgdtor_param *par,
   271				     struct xt_ct_target_info_v1 *info)
   272	{
   273		struct nf_conn *ct = info->ct;
   274		struct nf_conn_help *help;
   275	
   276		if (ct) {
   277			help = nfct_help(ct);
   278			if (help)
   279				nf_conntrack_helper_put(help->helper);
   280	
   281			nf_ct_netns_put(par->net, par->family);
   282	
 > 283			nf_ct_destroy_timeout(ct);
   284			nf_ct_put(info->ct);
   285		}
   286	}
   287	

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