drm/nouveau/dma: use rb_entry()

To make the code clearer, use rb_entry() instead of container_of() to
deal with rbtree.

Signed-off-by: Geliang Tang <geliangtang@gmail.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Geliang Tang 2016-12-20 22:02:11 +08:00 • committed by Ben Skeggs
commit 05073caeed