linux-phytec-ti

drm/i915: Do not mis-classify clean objects as purgeable

Whilst cleaning up the patches for submission, I mis-classified non-dirty
objects as purgeable. This was causing the backing pages for those
objects to be evicted under memory-pressure, discarding valid and
unreplaceable texture data.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>