drm/tests: Fix kunit_release_action ctx argument

The kunit_action_platform_driver_unregister is added with
&fake_platform_driver as ctx, but the kunit_release_action is called
pdev as ctx. Fix that by replacing it with &fake_platform_driver.

Fixes: 4f2b0b58 ("drm/tests: helpers: Switch to kunit actions")
Signed-off-by: Arthur Grillo <arthurgrillo@riseup.net>
Reviewed-by: Maíra Canal <mairacanal@riseup.net>
Acked-by: Maxime Ripard <mripard@kernel.org>
Signed-off-by: Maíra Canal <mairacanal@riseup.net>
Link: https://patchwork.freedesktop.org/patch/msgid/20230920-kunit-kasan-fixes-v1-1-1a0fc261832d@riseup.net

drivers/gpu/drm/tests/drm_kunit_helpers.c

@@ -118,7 +118,7 @@ void drm_kunit_helper_free_device(struct kunit *test, struct device *dev)
 
 	kunit_release_action(test,
 			     kunit_action_platform_driver_unregister,
-			     pdev);
+			     &fake_platform_driver);
 }
 EXPORT_SYMBOL_GPL(drm_kunit_helper_free_device);