usb: gadget: udc: net2272: 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/net2272.c

@@ -1511,12 +1511,13 @@ static int net2272_stop(struct usb_gadget *_gadget,
 	dev = container_of(_gadget, struct net2272, gadget);
 
 	spin_lock_irqsave(&dev->lock, flags);
-	stop_activity(dev, driver);
+	stop_activity(dev, NULL);
 	spin_unlock_irqrestore(&dev->lock, flags);
 
+	dev_dbg(dev->dev, "unregistered driver '%s'\n",
+			dev->driver->driver.name);
 	dev->driver = NULL;
 
-	dev_dbg(dev->dev, "unregistered driver '%s'\n", driver->driver.name);
 	return 0;
 }