ASoC: stm32: sai: 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/20190727150738.54764-16-yuehaibing@huawei.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/stm/stm32_sai.c

@@ -152,7 +152,6 @@ static int stm32_sai_probe(struct platform_device *pdev)
 {
 	struct stm32_sai_data *sai;
 	struct reset_control *rst;
-	struct resource *res;
 	const struct of_device_id *of_id;
 	u32 val;
 	int ret;
@@ -161,8 +160,7 @@ static int stm32_sai_probe(struct platform_device *pdev)
 	if (!sai)
 		return -ENOMEM;
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	sai->base = devm_ioremap_resource(&pdev->dev, res);
+	sai->base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(sai->base))
 		return PTR_ERR(sai->base);