[PATCH net-next] netfilter: nat: make symbol nat_hook static

[Wei Yongjun]

Fixes the following sparse warning:

net/netfilter/nf_nat_core.c:1039:20: warning:
 symbol 'nat_hook' was not declared. Should it be static?

Signed-off-by: Wei Yongjun <weiyongj...@huawei.com>
---
 net/netfilter/nf_nat_core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/netfilter/nf_nat_core.c b/net/netfilter/nf_nat_core.c
index 821f8d8..b7df32a 100644
--- a/net/netfilter/nf_nat_core.c
+++ b/net/netfilter/nf_nat_core.c
@@ -1036,7 +1036,7 @@ void nf_nat_unregister_fn(struct net *net, const struct 
nf_hook_ops *ops,
        .size = sizeof(struct nat_net),
 };
 
-struct nf_nat_hook nat_hook = {
+static struct nf_nat_hook nat_hook = {
        .parse_nat_setup        = nfnetlink_parse_nat_setup,
 #ifdef CONFIG_XFRM
        .decode_session         = __nf_nat_decode_session,