From 2f4a58e852d103488fc435f0c1ecbb9a86761579 Mon Sep 17 00:00:00 2001
From: Ben Skeggs <bskeggs@redhat.com>
Date: Wed, 3 Dec 2014 17:07:22 +1000
Subject: [PATCH] drm/nouveau/subdev: always upcast through
 nouveau_subdev()/nouveau_engine()

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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