ASoC: sirf: 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: NHulk Robot <hulkci@huawei.com>
Signed-off-by: NYueHaibing <yuehaibing@huawei.com>
Link: https://lore.kernel.org/r/20190727150738.54764-11-yuehaibing@huawei.comSigned-off-by: NMark Brown <broonie@kernel.org>

sound/soc/sirf/sirf-usp.c

@@ -359,7 +359,6 @@ static int sirf_usp_pcm_probe(struct platform_device *pdev)
 	int ret;
 	struct sirf_usp *usp;
 	void __iomem *base;
-	struct resource *mem_res;
 
 	usp = devm_kzalloc(&pdev->dev, sizeof(struct sirf_usp),
 			GFP_KERNEL);
@@ -368,8 +367,7 @@ static int sirf_usp_pcm_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, usp);
 
-	mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	base = devm_ioremap_resource(&pdev->dev, mem_res);
+	base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(base))
 		return PTR_ERR(base);
 	usp->regmap = devm_regmap_init_mmio(&pdev->dev, base,