[IPV4]: Remove prototype of ip_rt_advice

ip_rt_advice has been gone, so no need to keep prototype and debug message.
Signed-off-by: Denis V. Lunev <den@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/route.h

@@ -109,7 +109,6 @@ struct in_device;
 extern int		ip_rt_init(void);
 extern void		ip_rt_redirect(__be32 old_gw, __be32 dst, __be32 new_gw,
 				       __be32 src, struct net_device *dev);
-extern void		ip_rt_advice(struct rtable **rp, int advice);
 extern void		rt_cache_flush(int how);
 extern int		__ip_route_output_key(struct rtable **, const struct flowi *flp);
 extern int		ip_route_output_key(struct rtable **, struct flowi *flp);

net/ipv4/route.c

@@ -1161,7 +1161,7 @@ static struct dst_entry *ipv4_negative_advice(struct dst_entry *dst)
 			unsigned hash = rt_hash(rt->fl.fl4_dst, rt->fl.fl4_src,
 						rt->fl.oif);
 #if RT_CACHE_DEBUG >= 1
-			printk(KERN_DEBUG "ip_rt_advice: redirect to "
+			printk(KERN_DEBUG "ipv4_negative_advice: redirect to "
 					  "%u.%u.%u.%u/%02x dropped\n",
 				NIPQUAD(rt->rt_dst), rt->fl.fl4_tos);
 #endif