[PATCH] ipv6: include <net/addrconf.h> for missing declarations

["Ben Dooks (Codethink)" <ben.dooks@codethink.co.uk>]

Include <net/addrconf.h> for the missing declarations of
various functions. Fixes the following sparse warnings:

net/ipv6/addrconf_core.c:94:5: warning: symbol 'register_inet6addr_notifier' was not declared. Should it be static?
net/ipv6/addrconf_core.c:100:5: warning: symbol 'unregister_inet6addr_notifier' was not declared. Should it be static?
net/ipv6/addrconf_core.c:106:5: warning: symbol 'inet6addr_notifier_call_chain' was not declared. Should it be static?
net/ipv6/addrconf_core.c:112:5: warning: symbol 'register_inet6addr_validator_notifier' was not declared. Should it be static?
net/ipv6/addrconf_core.c:118:5: warning: symbol 'unregister_inet6addr_validator_notifier' was not declared. Should it be static?
net/ipv6/addrconf_core.c:125:5: warning: symbol 'inet6addr_validator_notifier_call_chain' was not declared. Should it be static?
net/ipv6/addrconf_core.c:237:6: warning: symbol 'in6_dev_finish_destroy' was not declared. Should it be static?

Signed-off-by: Ben Dooks (Codethink) <ben.dooks@codethink.co.uk>
---
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
Cc: Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>
Cc: netdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
---
 net/ipv6/addrconf_core.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/ipv6/addrconf_core.c b/net/ipv6/addrconf_core.c
index 783f3c1466da..2fc079284ca4 100644
--- a/net/ipv6/addrconf_core.c
+++ b/net/ipv6/addrconf_core.c
@@ -7,6 +7,7 @@
 #include <linux/export.h>
 #include <net/ipv6.h>
 #include <net/ipv6_stubs.h>
+#include <net/addrconf.h>
 #include <net/ip.h>
 
 /* if ipv6 module registers this function is used by xfrm to force all
-- 
2.23.0