usb: host: ohci-exynos: fix PHY error handling

PHY layer no longer returns NULL. We must
switch from IS_ERR_OR_NULL() to IS_ERR().

Signed-off-by: Felipe Balbi <balbi@ti.com>

drivers/usb/host/ohci-exynos.c

@@ -128,7 +128,7 @@ static int exynos_ohci_probe(struct platform_device *pdev)
 		return -ENOMEM;
 
 	phy = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2);
-	if (IS_ERR_OR_NULL(phy)) {
+	if (IS_ERR(phy)) {
 		/* Fallback to pdata */
 		if (!pdata) {
 			dev_warn(&pdev->dev, "no platform data or transceiver defined\n");