vxlan: use htonl when snooping for loopback address

Currently "bridge fdb show dev vxlan0" lists loopback address as
"1.0.0.127". Using htonl(INADDR_LOOPBACK) rather than passing it
directly to vxlan_snoop fixes the problem.
Signed-off-by: Mike Rapoport <mike.rapoport@ravellosystems.com>
Acked-by: Cong Wang <xiyou.wangcong@gmail.com>
Acked-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/vxlan.c

@@ -925,7 +925,8 @@ static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
 	__skb_pull(skb, skb_network_offset(skb));
 
 	if (dst_vxlan->flags & VXLAN_F_LEARN)
-		vxlan_snoop(skb->dev, INADDR_LOOPBACK, eth_hdr(skb)->h_source);
+		vxlan_snoop(skb->dev, htonl(INADDR_LOOPBACK),
+			    eth_hdr(skb)->h_source);
 
 	u64_stats_update_begin(&tx_stats->syncp);
 	tx_stats->tx_packets++;