net: remove NET_RX_BAD and NET_RX_CN* defines

almost no users in the tree; and the few that use them treat them
like NET_RX_DROP.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/lapb/lapb_iface.c b/net/lapb/lapb_iface.c
index 2ba1bc4..bda96d1 100644
--- a/net/lapb/lapb_iface.c
+++ b/net/lapb/lapb_iface.c
@@ -407,7 +407,7 @@
 		return lapb->callbacks.data_indication(lapb->dev, skb);
 
 	kfree_skb(skb);
-	return NET_RX_CN_HIGH; /* For now; must be != NET_RX_DROP */
+	return NET_RX_SUCCESS; /* For now; must be != NET_RX_DROP */
 }
 
 int lapb_data_transmit(struct lapb_cb *lapb, struct sk_buff *skb)