pkt_sched: Remove 'dev' member of struct Qdisc.

It can be obtained via the netdev_queue.  So create a helper routine,
qdisc_dev(), to make the transformations nicer looking.

Now, qdisc_alloc() now no longer needs a net_device pointer argument.

Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/sched/sch_atm.c b/net/sched/sch_atm.c
index 3dddab5..0de757e 100644
--- a/net/sched/sch_atm.c
+++ b/net/sched/sch_atm.c
@@ -296,7 +296,7 @@
 		goto err_out;
 	}
 	flow->filter_list = NULL;
-	flow->q = qdisc_create_dflt(sch->dev, sch->dev_queue,
+	flow->q = qdisc_create_dflt(qdisc_dev(sch), sch->dev_queue,
 				    &pfifo_qdisc_ops, classid);
 	if (!flow->q)
 		flow->q = &noop_qdisc;
@@ -556,7 +556,7 @@
 
 	pr_debug("atm_tc_init(sch %p,[qdisc %p],opt %p)\n", sch, p, opt);
 	p->flows = &p->link;
-	p->link.q = qdisc_create_dflt(sch->dev, sch->dev_queue,
+	p->link.q = qdisc_create_dflt(qdisc_dev(sch), sch->dev_queue,
 				      &pfifo_qdisc_ops, sch->handle);
 	if (!p->link.q)
 		p->link.q = &noop_qdisc;