[Intel-gfx] [PATCH 9/9] drm/i915: Drop unpin stall in atomic_prepare_commit

[Chris Wilson]

Quoting Daniel Vetter (2017-07-19 13:55:02)
> The core already does this in setup_commit(). With this we can also
> remove the unpin_work_count since it's the last user.

Also note that the loop only existed for the legacy pageflip support,
with that removed it becomes entirely redundant.
-Chris