drm: Avoid use-before-null-test on dev in drm_cleanup().
Signed-off-by: NEric Anholt <eric@anholt.net> Signed-off-by: NDave Airlie <airlied@linux.ie>
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Signed-off-by: NEric Anholt <eric@anholt.net> Signed-off-by: NDave Airlie <airlied@linux.ie>