drm/tests: modes: Remove call to drm_kunit_helper_free_device()

Calling drm_kunit_helper_free_device() to clean up the resources
allocated by drm_kunit_helper_alloc_device() is now optional and not
needed in most cases.

Remove it.

Reviewed-by: Javier Martinez Canillas <[e-mail]>
Reviewed-by: Maíra Canal <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Maxime Ripard <[e-mail]>

drivers/gpu/drm/tests/drm_modes_test.c

···
 	return 0;
 }
 
-static void drm_test_modes_exit(struct kunit *test)
-{
-	struct drm_test_modes_priv *priv = test->priv;
-
-	drm_kunit_helper_free_device(test, priv->dev);
-}
-
 static void drm_test_modes_analog_tv_ntsc_480i(struct kunit *test)
 {
 	struct drm_test_modes_priv *priv = test->priv;
···
 static struct kunit_suite drm_modes_analog_tv_test_suite = {
 	.name = "drm_modes_analog_tv",
 	.init = drm_test_modes_init,
-	.exit = drm_test_modes_exit,
 	.test_cases = drm_modes_analog_tv_tests,
 };