ipv6: call consume_skb() in frag/reassembly

Some kfree_skb() calls should be replaced by consume_skb() to avoid
drop_monitor/dropwatch false positives.

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

net/ipv6/ip6_output.c

@@ -210,7 +210,7 @@ int ip6_xmit(struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6,
 				kfree_skb(skb);
 				return -ENOBUFS;
 			}
-			kfree_skb(skb);
+			consume_skb(skb);
 			skb = skb2;
 			skb_set_owner_w(skb, sk);
 		}
@@ -889,7 +889,7 @@ slow_path:
 	}
 	IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
 		      IPSTATS_MIB_FRAGOKS);
-	kfree_skb(skb);
+	consume_skb(skb);
 	return err;
 
 fail:

net/ipv6/reassembly.c

@@ -433,7 +433,7 @@ static int ip6_frag_reasm(struct frag_queue *fq, struct sk_buff *prev,
 		skb_morph(head, fq->q.fragments);
 		head->next = fq->q.fragments->next;
 
-		kfree_skb(fq->q.fragments);
+		consume_skb(fq->q.fragments);
 		fq->q.fragments = head;
 	}