nl80211: fix missing nesting

commit 95a6ccbb46c70cff376684c752831c014c87029d
Author: Johannes Berg <johannes.berg@intel.com>
Date:   Thu Aug 12 15:38:38 2010 +0200

    cfg80211/mac80211: extensible frame processing

introduced a netlink bug that caused parsing errors
in userspace because it forgot to close a nesting,
which would advertise a nesting length of zero to
userspace, which then completely threw off parsing
and led to

	Illegal nla->nla_type == 0

being printed by libnl.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

net/wireless/nl80211.c

@@ -636,6 +636,8 @@ static int nl80211_send_wiphy(struct sk_buff *msg, u32 pid, u32 seq, int flags,
 			nla_nest_end(msg, nl_ftypes);
 		}
 
+		nla_nest_end(msg, nl_ifs);
+
 		nl_ifs = nla_nest_start(msg, NL80211_ATTR_RX_FRAME_TYPES);
 		if (!nl_ifs)
 			goto nla_put_failure;