ASoC: kirkwood-i2s: use devm_platform_ioremap_resource() to simplify code

Use devm_platform_ioremap_resource() to simplify the code a bit.
This is detected by coccinelle.
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Link: https://lore.kernel.org/r/20190727150738.54764-14-yuehaibing@huawei.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/kirkwood/kirkwood-i2s.c

@@ -523,7 +523,6 @@ static int kirkwood_i2s_dev_probe(struct platform_device *pdev)
 	struct kirkwood_asoc_platform_data *data = pdev->dev.platform_data;
 	struct snd_soc_dai_driver *soc_dai = kirkwood_i2s_dai;
 	struct kirkwood_dma_data *priv;
-	struct resource *mem;
 	struct device_node *np = pdev->dev.of_node;
 	int err;
 
@@ -533,8 +532,7 @@ static int kirkwood_i2s_dev_probe(struct platform_device *pdev)
 
 	dev_set_drvdata(&pdev->dev, priv);
 
-	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	priv->io = devm_ioremap_resource(&pdev->dev, mem);
+	priv->io = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(priv->io))
 		return PTR_ERR(priv->io);