ipv6: remove unused function ipv6_inherit_linklocal()

It is no longer used after commit e837735ec4
(ip6_tunnel: ensure to always have a link local address).

Cc: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Acked-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv6/addrconf.c

@@ -2818,18 +2818,6 @@ static void addrconf_gre_config(struct net_device *dev)
 }
 #endif
 
-static inline int
-ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
-{
-	struct in6_addr lladdr;
-
-	if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
-		addrconf_add_linklocal(idev, &lladdr);
-		return 0;
-	}
-	return -1;
-}
-
 static int addrconf_notify(struct notifier_block *this, unsigned long event,
 			   void *ptr)
 {