ASoC: psc-ac97: 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/20190727150738.54764-24-yuehaibing@huawei.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/au1x/psc-ac97.c

@@ -363,7 +363,7 @@ static const struct snd_soc_component_driver au1xpsc_ac97_component = {
 static int au1xpsc_ac97_drvprobe(struct platform_device *pdev)
 {
 	int ret;
-	struct resource *iores, *dmares;
+	struct resource *dmares;
 	unsigned long sel;
 	struct au1xpsc_audio_data *wd;
 
@@ -374,8 +374,7 @@ static int au1xpsc_ac97_drvprobe(struct platform_device *pdev)
 
 	mutex_init(&wd->lock);
 
-	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);