net: vxlan: use kfree_skb_reason() in vxlan_encap_bypass()

Replace kfree_skb with kfree_skb_reason in vxlan_encap_bypass, and no new
skb drop reason is added in this commit.

Signed-off-by: Menglong Dong <dongml2@chinatelecom.cn>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/vxlan/vxlan_core.c

@@ -2290,7 +2290,7 @@ static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
 	rcu_read_lock();
 	dev = skb->dev;
 	if (unlikely(!(dev->flags & IFF_UP))) {
-		kfree_skb(skb);
+		kfree_skb_reason(skb, SKB_DROP_REASON_DEV_READY);
 		goto drop;
 	}