ASoC: rockchip: spdif: Convert to use devm_snd_dmaengine_pcm_register

Use resource managed API then we can remove snd_dmaengine_pcm_unregister()
and snd_soc_unregister_component() calls in .probe error path and .remove.

Signed-off-by: Axel Lin <[e-mail]>
Signed-off-by: Mark Brown <[e-mail]>

sound/soc/rockchip/rockchip_spdif.c

···
 		goto err_pm_runtime;
 	}
 
-	ret = snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);
+	ret = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);
 	if (ret) {
 		dev_err(&pdev->dev, "Could not register PCM\n");
-		goto err_pcm_register;
+		goto err_pm_runtime;
 	}
 
 	return 0;
 
-err_pcm_register:
-	snd_dmaengine_pcm_unregister(&pdev->dev);
 err_pm_runtime:
 	pm_runtime_disable(&pdev->dev);
 
···
 
 	clk_disable_unprepare(spdif->mclk);
 	clk_disable_unprepare(spdif->hclk);
-	snd_dmaengine_pcm_unregister(&pdev->dev);
-	snd_soc_unregister_component(&pdev->dev);
 
 	return 0;
 }