ASoC: fsl_audmix: 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/20190727150738.54764-9-yuehaibing@huawei.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/fsl/fsl_audmix.c

@@ -458,7 +458,6 @@ static int fsl_audmix_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct fsl_audmix *priv;
-	struct resource *res;
 	const char *mdrv;
 	const struct of_device_id *of_id;
 	void __iomem *regs;
@@ -475,8 +474,7 @@ static int fsl_audmix_probe(struct platform_device *pdev)
 		return -ENOMEM;
 
 	/* Get the addresses */
-	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);