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The *_mock_device functions allocate a DRM device that needs to be released using drm_dev_unregister. Now that we have a kunit release action API, we can switch to it and don't require any kind of garbage collection from the caller. Reviewed-by: Javier Martinez Canillas <javierm@redhat.com> Reviewed-by: Maíra Canal <mairacanal@riseup.net> Link: https://lore.kernel.org/r/20230728-kms-kunit-actions-rework-v3-8-952565ccccfe@kernel.org Signed-off-by: Maxime Ripard <mripard@kernel.org>