usb: dwc3: keystone: remove duplicate check on resource

Sanity check on resource happening with devm_ioremap_resource().
Signed-off-by: Varka Bhadram <varkab@cdac.in>
Signed-off-by: Felipe Balbi <balbi@ti.com>

drivers/usb/dwc3/dwc3-keystone.c

@@ -104,11 +104,6 @@ static int kdwc3_probe(struct platform_device *pdev)
 	kdwc->dev = dev;
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!res) {
-		dev_err(dev, "missing usbss resource\n");
-		return -EINVAL;
-	}
-
 	kdwc->usbss = devm_ioremap_resource(dev, res);
 	if (IS_ERR(kdwc->usbss))
 		return PTR_ERR(kdwc->usbss);