[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>
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 79c4b93..d2bc614 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -1161,7 +1161,7 @@
 			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