usb: gadget: udc: fsl_qe: do not rely on 'driver' argument

future patches will remove the extra 'driver'
argument to ->udc_stop(), in order to do that,
we must make sure that our UDC does not rely
on it first.

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

drivers/usb/gadget/udc/fsl_qe_udc.c

@@ -2334,10 +2334,10 @@ static int fsl_qe_stop(struct usb_gadget *gadget,
 		nuke(loop_ep, -ESHUTDOWN);
 	spin_unlock_irqrestore(&udc->lock, flags);
 
+	dev_info(udc->dev, "unregistered gadget driver '%s'\r\n",
+			udc->driver->driver.name);
 	udc->driver = NULL;
 
-	dev_info(udc->dev, "unregistered gadget driver '%s'\r\n",
-			driver->driver.name);
 	return 0;
 }