[IPV4]: make two functions static

This patch makes two needlessly global functions static.

Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index 4e9c74b..a4c347c 100644
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -1217,7 +1217,7 @@
 	return 0;
 }
 
-int __init ipgre_fb_tunnel_init(struct net_device *dev)
+static int __init ipgre_fb_tunnel_init(struct net_device *dev)
 {
 	struct ip_tunnel *tunnel = (struct ip_tunnel*)dev->priv;
 	struct iphdr *iph = &tunnel->parms.iph;