MIPS: OCTEON: octeon-usb: Use devm_platform_get_and_ioremap_resource()

Remove unneeded error handling on the result of a call
to platform_get_resource() when the value is passed to
devm_ioremap_resource().

And use devm_platform_get_and_ioremap_resource() to simplify
code.
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

arch/mips/cavium-octeon/octeon-usb.c

@@ -516,20 +516,13 @@ static int __init dwc3_octeon_device_init(void)
 			if (!pdev)
 				return -ENODEV;
 
-			res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-			if (res == NULL) {
-				put_device(&pdev->dev);
-				dev_err(&pdev->dev, "No memory resources\n");
-				return -ENXIO;
-			}
-
 			/*
 			 * The code below maps in the registers necessary for
 			 * setting up the clocks and reseting PHYs. We must
 			 * release the resources so the dwc3 subsystem doesn't
 			 * know the difference.
 			 */
-			base = devm_ioremap_resource(&pdev->dev, res);
+			base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
 			if (IS_ERR(base)) {
 				put_device(&pdev->dev);
 				return PTR_ERR(base);