[PATCH net-next] netfilter: nf_conntrack_bridge: Fix build error without IPV6

[YueHaibing]

Fix gcc build error while CONFIG_IPV6 is not set

In file included from net/netfilter/core.c:19:0:
./include/linux/netfilter_ipv6.h: In function 'nf_ipv6_br_defrag':
./include/linux/netfilter_ipv6.h:110:9: error: implicit declaration of function 'nf_ct_frag6_gather' [-Werror=implicit-function-declaration]

Reported-by: Hulk Robot <hulkci@xxxxxxxxxx>
Fixes: 764dd163ac92 ("netfilter: nf_conntrack_bridge: add support for IPv6")
Signed-off-by: YueHaibing <yuehaibing@xxxxxxxxxx>
---
 include/linux/netfilter_ipv6.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/linux/netfilter_ipv6.h b/include/linux/netfilter_ipv6.h
index a21b8c9..4ea97fd 100644
--- a/include/linux/netfilter_ipv6.h
+++ b/include/linux/netfilter_ipv6.h
@@ -96,6 +96,8 @@ static inline int nf_ip6_route(struct net *net, struct dst_entry **dst,
 #endif
 }
 
+int nf_ct_frag6_gather(struct net *net, struct sk_buff *skb, u32 user);
+
 static inline int nf_ipv6_br_defrag(struct net *net, struct sk_buff *skb,
 				    u32 user)
 {
-- 
2.7.4