netfilter: ebt_nflog: fix unexpected truncated packet

"struct nf_loginfo li;" is a local variable, so we should set the flags
to 0 explicitly, else, packets maybe truncated unexpectedly when copied
to the userspace.

Fixes: 7643507f ("netfilter: xt_NFLOG: nflog-range does not truncate packets")
Cc: Vishwanath Pai <vpai@akamai.com>
Signed-off-by: Liping Zhang <zlpnobody@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

net/bridge/netfilter/ebt_nflog.c

@@ -30,6 +30,7 @@ ebt_nflog_tg(struct sk_buff *skb, const struct xt_action_param *par)
 	li.u.ulog.copy_len = info->len;
 	li.u.ulog.group = info->group;
 	li.u.ulog.qthreshold = info->threshold;
+	li.u.ulog.flags = 0;
 
 	nf_log_packet(net, PF_BRIDGE, xt_hooknum(par), skb, xt_in(par),
 		      xt_out(par), &li, "%s", info->prefix);