usb: cdns3: Error out if USB_DR_MODE_UNKNOWN in cdns3_core_init_role()

USB_DR_MODE_UNKNOWN should be treated as error as it is done in
cdns3_drd_update_mode().

Fixes: 02ffc26d ("usb: cdns3: fix cdns3_core_init_role()")
Signed-off-by: Roger Quadros <rogerq@ti.com>
Link: https://lore.kernel.org/r/20191017075801.8734-1-rogerq@ti.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/cdns3/core.c

@@ -166,7 +166,6 @@ static int cdns3_core_init_role(struct cdns3 *cdns)
 		goto err;
 
 	switch (cdns->dr_mode) {
-	case USB_DR_MODE_UNKNOWN:
 	case USB_DR_MODE_OTG:
 		ret = cdns3_hw_role_switch(cdns);
 		if (ret)
@@ -182,6 +181,9 @@ static int cdns3_core_init_role(struct cdns3 *cdns)
 		if (ret)
 			goto err;
 		break;
+	default:
+		ret = -EINVAL;
+		goto err;
 	}
 
 	return ret;