ASoC: tegra20_das: 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/20190727150738.54764-2-yuehaibing@huawei.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/tegra/tegra20_das.c

@@ -120,7 +120,6 @@ static const struct regmap_config tegra20_das_regmap_config = {
 
 static int tegra20_das_probe(struct platform_device *pdev)
 {
-	struct resource *res;
 	void __iomem *regs;
 	int ret = 0;
 
@@ -134,8 +133,7 @@ static int tegra20_das_probe(struct platform_device *pdev)
 	}
 	das->dev = &pdev->dev;
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	regs = devm_ioremap_resource(&pdev->dev, res);
+	regs = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(regs)) {
 		ret = PTR_ERR(regs);
 		goto err;