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In order to pass functions to kunit_add_action(), they need to be of the kunit_action_t type. While casting the function pointer can work, it will break control-flow integrity. vc4_mock already defines such a wrapper for drm_dev_unregister(), but it involves less boilerplate to use the new macro, so replace the manual implementation. Signed-off-by: David Gow <davidgow@google.com> Reviewed-by: Maxime Ripard <mripard@kernel.org> Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>