staging: emxx_udc: use devm_platform_ioremap_resource() to simplify code

Use devm_platform_ioremap_resource() to simplify the code a bit.
This is detected by coccinelle.
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Link: https://lore.kernel.org/r/20191009150535.6412-1-yuehaibing@huawei.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/emxx_udc/emxx_udc.c

@@ -3078,7 +3078,6 @@ static int nbu2ss_drv_probe(struct platform_device *pdev)
 {
 	int	status = -ENODEV;
 	struct nbu2ss_udc	*udc;
-	struct resource *r;
 	int irq;
 	void __iomem *mmio_base;
 
@@ -3088,8 +3087,7 @@ static int nbu2ss_drv_probe(struct platform_device *pdev)
 	platform_set_drvdata(pdev, udc);
 
 	/* require I/O memory and IRQ to be provided as resources */
-	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	mmio_base = devm_ioremap_resource(&pdev->dev, r);
+	mmio_base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(mmio_base))
 		return PTR_ERR(mmio_base);