ipv6: ip6_route_output does not modify sk parameter, so make it const

This avoids explicit cast to avoid 'discards qualifiers'
compiler warning in a netfilter patch that i've been working on.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/ip6_route.h b/include/net/ip6_route.h
index 642a80b..c850e5f 100644
--- a/include/net/ip6_route.h
+++ b/include/net/ip6_route.h
@@ -70,7 +70,7 @@
 extern void			ip6_route_input(struct sk_buff *skb);
 
 extern struct dst_entry *	ip6_route_output(struct net *net,
-						 struct sock *sk,
+						 const struct sock *sk,
 						 struct flowi6 *fl6);
 
 extern int			ip6_route_init(void);