drm/nouveau/subdev: always upcast through nouveau_subdev()/nouveau_engine()
authorBen Skeggs <bskeggs@redhat.com>
Wed, 3 Dec 2014 07:07:22 +0000 (17:07 +1000)
committerBen Skeggs <bskeggs@redhat.com>
Thu, 22 Jan 2015 02:14:42 +0000 (12:14 +1000)
Has additional safeties for one.  For two, needed for an upcoming
commit that removes abuse of nouveau_object.engine.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

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