ASoC: smdk_wm8994: Use devm_snd_soc_unregister_card()

	platform_set_drvdata(pdev, board);

	ret = snd_soc_register_card(card);

	ret = devm_snd_soc_register_card(&pdev->dev, card);

	if (ret)

		dev_err(&pdev->dev, "snd_soc_register_card() failed:%d\n", ret);

	return ret;

}

static int smdk_audio_remove(struct platform_device *pdev)

{

	struct snd_soc_card *card = platform_get_drvdata(pdev);

	snd_soc_unregister_card(card);

	return 0;

}

static struct platform_driver smdk_audio_driver = {

	.driver		= {

		.name	= "smdk-audio-wm8894",

		.of_match_table = of_match_ptr(samsung_wm8994_of_match),

	},

	.probe		= smdk_audio_probe,

	.remove		= smdk_audio_remove,

};

module_platform_driver(smdk_audio_driver);