[LIBNL 05/09]: nfnetlink_log: only set hwproto if not zero

[Patrick McHardy <kaber@trash.net>]

commit 26b35449524246778d4a14c3805430797c29c039
Author: Patrick McHardy <kaber@trash.net>
Date:   Fri Jan 18 17:44:52 2008 +0100

    [LIBNL]: nfnetlink_log: only set hwproto if not zero
    
    The hwproto doesn't have its own attribute and is also present when
    not set. Don't set the attribute if its value is zero.
    
    Signed-off-by: Patrick McHardy <kaber@trash.net>

diff --git a/lib/netfilter/log.c b/lib/netfilter/log.c
index a6bf3d5..a900927 100644
--- a/lib/netfilter/log.c
+++ b/lib/netfilter/log.c
@@ -86,7 +86,8 @@ struct nfnl_log *nfnlmsg_log_parse(struct nlmsghdr *nlh)
 	if (attr) {
 		struct nfulnl_msg_packet_hdr *hdr = nla_data(attr);
 
-		nfnl_log_set_hwproto(log, hdr->hw_protocol);
+		if (hdr->hw_protocol)
+			nfnl_log_set_hwproto(log, hdr->hw_protocol);
 		nfnl_log_set_hook(log, hdr->hook);
 	}