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_dsmark.c b/net/sched/sch_dsmark.c
index c955ba2..3aafbd1 100644
--- a/net/sched/sch_dsmark.c
+++ b/net/sched/sch_dsmark.c
@@ -60,7 +60,7 @@
 		sch, p, new, old);
 
 	if (new == NULL) {
-		new = qdisc_create_dflt(sch->dev, sch->dev_queue,
+		new = qdisc_create_dflt(qdisc_dev(sch), sch->dev_queue,
 					&pfifo_qdisc_ops,
 					sch->handle);
 		if (new == NULL)
@@ -391,7 +391,7 @@
 	p->default_index = default_index;
 	p->set_tc_index = nla_get_flag(tb[TCA_DSMARK_SET_TC_INDEX]);
 
-	p->q = qdisc_create_dflt(sch->dev, sch->dev_queue,
+	p->q = qdisc_create_dflt(qdisc_dev(sch), sch->dev_queue,
 				 &pfifo_qdisc_ops, sch->handle);
 	if (p->q == NULL)
 		p->q = &noop_qdisc;