usb: gadget: net2272: don't assign gadget.dev.release directly

udc-core provides a better way to handle release
methods, let's use it.

Signed-off-by: Felipe Balbi <balbi@ti.com>
diff --git a/drivers/usb/gadget/net2272.c b/drivers/usb/gadget/net2272.c
index af99223..8dcbe77 100644
--- a/drivers/usb/gadget/net2272.c
+++ b/drivers/usb/gadget/net2272.c
@@ -2233,7 +2233,6 @@
 	ret->gadget.max_speed = USB_SPEED_HIGH;
 
 	/* the "gadget" abstracts/virtualizes the controller */
-	ret->gadget.dev.release = net2272_gadget_release;
 	ret->gadget.name = driver_name;
 
 	return ret;
@@ -2273,7 +2272,8 @@
 	if (ret)
 		goto err_irq;
 
-	ret = usb_add_gadget_udc(dev->dev, &dev->gadget);
+	ret = usb_add_gadget_udc_release(dev->dev, &dev->gadget,
+			net2272_gadget_release);
 	if (ret)
 		goto err_add_udc;