tc: save error code for rtnl_tc_data_check()

Cc: Thomas Graf <tgraf@suug.ch>
Cc: Thomas Haller <thaller@redhat.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Acked-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: Thomas Haller <thaller@redhat.com>
qdisc: add hfsc qdisc support

Cc: Thomas Graf <tgraf@suug.ch>
Cc: Thomas Haller <thaller@redhat.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Acked-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: Thomas Haller <thaller@redhat.com>
Merge branch 'hfsc-qdisc-support'

http://lists.infradead.org/pipermail/libnl/2014-July/001566.html
http://lists.infradead.org/pipermail/libnl/2014-July/001594.html

Signed-off-by: Thomas Haller <thaller@redhat.com>