netlink: dont drop packet but consume it

When we need to clone skb, we dont drop a packet.
Call consume_skb() to not confuse dropwatch.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/netlink/af_netlink.c

@@ -866,7 +866,7 @@ static struct sk_buff *netlink_trim(struct sk_buff *skb, gfp_t allocation)
 		struct sk_buff *nskb = skb_clone(skb, allocation);
 		if (!nskb)
 			return skb;
-		kfree_skb(skb);
+		consume_skb(skb);
 		skb = nskb;
 	}