ipv6: add IPv6 to neighbour table overflow warning

IPv4 and IPv6 have separate neighbour tables, so
the warning messages should be distinguishable.

[ Add a suitable message prefix on the ipv4 side as well -DaveM ]

Signed-off-by: Ulrich Weber <uweber@astaro.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index d126365..8323136 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -670,7 +670,7 @@
 
 			if (net_ratelimit())
 				printk(KERN_WARNING
-				       "Neighbour table overflow.\n");
+				       "ipv6: Neighbour table overflow.\n");
 			dst_free(&rt->dst);
 			return NULL;
 		}