[IPV4]: Make struct ipv4_devconf static.

struct ipv4_devconf can now become static.
Signed-off-by: NAdrian Bunk <bunk@kernel.org>
Acked-by: NPavel Emelyanov <xemul@openvz.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

include/linux/inetdevice.h

@@ -17,8 +17,6 @@ struct ipv4_devconf
 	DECLARE_BITMAP(state, __NET_IPV4_CONF_MAX - 1);
 };
 
-extern struct ipv4_devconf ipv4_devconf;
-
 struct in_device
 {
 	struct net_device	*dev;

net/ipv4/devinet.c

@@ -64,7 +64,7 @@
 #include <net/rtnetlink.h>
 #include <net/net_namespace.h>
 
-struct ipv4_devconf ipv4_devconf = {
+static struct ipv4_devconf ipv4_devconf = {
 	.data = {
 		[NET_IPV4_CONF_ACCEPT_REDIRECTS - 1] = 1,
 		[NET_IPV4_CONF_SEND_REDIRECTS - 1] = 1,