nft: arp: initialize flags in nft_arp_parse_meta

This small patch initialize the flags in nft_arp_parse_meta,
now the nft_arp_rule_find is working properly.

Signed-off-by: Giuseppe Longo <giuseppelng@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
diff --git a/iptables/nft-arp.c b/iptables/nft-arp.c
index 0460066..570962d 100644
--- a/iptables/nft-arp.c
+++ b/iptables/nft-arp.c
@@ -267,7 +267,7 @@
 			       void *data)
 {
 	struct arpt_entry *fw = data;
-	uint8_t flags;
+	uint8_t flags = 0;
 
 	parse_meta(e, key, fw->arp.iniface, fw->arp.iniface_mask,
 		   fw->arp.outiface, fw->arp.outiface_mask,