ASoC: au1x: psc-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/20190727150738.54764-25-yuehaibing@huawei.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/au1x/psc-i2s.c

@@ -291,7 +291,7 @@ static const struct snd_soc_component_driver au1xpsc_i2s_component = {
 
 static int au1xpsc_i2s_drvprobe(struct platform_device *pdev)
 {
-	struct resource *iores, *dmares;
+	struct resource *dmares;
 	unsigned long sel;
 	struct au1xpsc_audio_data *wd;
 
@@ -300,8 +300,7 @@ static int au1xpsc_i2s_drvprobe(struct platform_device *pdev)
 	if (!wd)
 		return -ENOMEM;
 
-	iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	wd->mmio = devm_ioremap_resource(&pdev->dev, iores);
+	wd->mmio = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(wd->mmio))
 		return PTR_ERR(wd->mmio);