ipv6: make struct ipv6_devconf static

struct ipv6_devconf can now become static.
Signed-off-by: Adrian Bunk <bunk@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/if_inet6.h

@@ -193,8 +193,6 @@ struct inet6_dev
 	struct rcu_head		rcu;
 };
 
-extern struct ipv6_devconf ipv6_devconf;
-
 static inline void ipv6_eth_mc_map(struct in6_addr *addr, char *buf)
 {
 	/*

net/ipv6/addrconf.c

@@ -153,7 +153,7 @@ static int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
 
 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
 
-struct ipv6_devconf ipv6_devconf __read_mostly = {
+static struct ipv6_devconf ipv6_devconf __read_mostly = {
 	.forwarding		= 0,
 	.hop_limit		= IPV6_DEFAULT_HOPLIMIT,
 	.mtu6			= IPV6_MIN_MTU,