usb: gadget: pxa25x_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.
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Link: https://lore.kernel.org/r/20190904094222.23128-1-yuehaibing@huawei.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/gadget/udc/pxa25x_udc.c

@@ -2321,7 +2321,6 @@ static int pxa25x_udc_probe(struct platform_device *pdev)
 	struct pxa25x_udc *dev = &memory;
 	int retval, irq;
 	u32 chiprev;
-	struct resource *res;
 
 	pr_info("%s: version %s\n", driver_name, DRIVER_VERSION);
 
@@ -2367,8 +2366,7 @@ static int pxa25x_udc_probe(struct platform_device *pdev)
 	if (irq < 0)
 		return -ENODEV;
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	dev->regs = devm_ioremap_resource(&pdev->dev, res);
+	dev->regs = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(dev->regs))
 		return PTR_ERR(dev->regs);