The WARN_ON(root == &noop_qdisc)) added in qdisc_list_add()
can trigger in normal conditions when devices are not up.
It should be done only right before the list_add_tail() call.

Fixes: e57a784d ("pkt_sched: set root qdisc before change() in attach_default_qdiscs()")
Reported-by: NValdis Kletnieks <Valdis.Kletnieks@vt.edu>
Tested-by: NMirco Tischler <mt-ml@gmx.de>
Signed-off-by: NEric Dumazet <edumazet@google.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>