ipv6: make __ipv6_isatap_ifid static

Another exported symbol only used in one file
Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Acked-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/addrconf.h

@@ -276,8 +276,6 @@ static inline int ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
 		(addr->s6_addr32[3] ^ htonl(0x00000002))) == 0;
 }
 
-extern int __ipv6_isatap_ifid(u8 *eui, __be32 addr);
-
 static inline int ipv6_addr_is_isatap(const struct in6_addr *addr)
 {
 	return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE);

net/ipv6/addrconf.c

@@ -1544,7 +1544,7 @@ static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
 	return 0;
 }
 
-int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
+static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
 {
 	if (addr == 0)
 		return -1;
@@ -1560,7 +1560,6 @@ int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
 	memcpy(eui + 4, &addr, 4);
 	return 0;
 }
-EXPORT_SYMBOL(__ipv6_isatap_ifid);
 
 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
 {