ipv6: bool/const conversions phase2

Mostly bool conversions, some inline removals and const additions.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/ip6_route.h b/include/net/ip6_route.h
index c062b67..37c1a1e 100644
--- a/include/net/ip6_route.h
+++ b/include/net/ip6_route.h
@@ -175,7 +175,7 @@
 	spin_unlock(&sk->sk_dst_lock);
 }
 
-static inline int ipv6_unicast_destination(struct sk_buff *skb)
+static inline bool ipv6_unicast_destination(const struct sk_buff *skb)
 {
 	struct rt6_info *rt = (struct rt6_info *) skb_dst(skb);