ASoC: meson: axg-pdm: 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/20190727150738.54764-28-yuehaibing@huawei.com
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/meson/axg-pdm.c

@@ -585,7 +585,6 @@ static int axg_pdm_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct axg_pdm *priv;
-	struct resource *res;
 	void __iomem *regs;
 	int ret;
 
@@ -600,8 +599,7 @@ static int axg_pdm_probe(struct platform_device *pdev)
 		return -ENODEV;
 	}
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	regs = devm_ioremap_resource(dev, res);
+	regs = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(regs))
 		return PTR_ERR(regs);