drm/i915: Correct a comment about the use of the workqueue.
It isn't used for the hangcheck, which does its work right from the timer trigger, but hangcheck can lead to error state recording, which is run off of the workqueue. Signed-off-by: NEric Anholt <eric@anholt.net> Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk>
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