usb/hcd: don't return 0 on error in usb_add_hcd()

If USB type detections fails, we run into default and return 0.
Signed-off-by: NSebastian Andrzej Siewior <bigeasy@linutronix.de>
Acked-by: NAlan Stern <stern@rowland.harvard.edu>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

drivers/usb/core/hcd.c

@@ -2407,6 +2407,7 @@ int usb_add_hcd(struct usb_hcd *hcd,
 		rhdev->speed = USB_SPEED_SUPER;
 		break;
 	default:
+		retval = -EINVAL;
 		goto err_set_rh_speed;
 	}