usb: gadget: goku_udc: 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/goku_udc.c b/drivers/usb/gadget/goku_udc.c
index aa1976e..991aba3 100644
--- a/drivers/usb/gadget/goku_udc.c
+++ b/drivers/usb/gadget/goku_udc.c
@@ -1749,7 +1749,6 @@
 	dev->gadget.max_speed = USB_SPEED_FULL;
 
 	/* the "gadget" abstracts/virtualizes the controller */
-	dev->gadget.dev.release = gadget_release;
 	dev->gadget.name = driver_name;
 
 	/* now all the pci goodies ... */
@@ -1800,7 +1799,8 @@
 	create_proc_read_entry(proc_node_name, 0, NULL, udc_proc_read, dev);
 #endif
 
-	retval = usb_add_gadget_udc(&pdev->dev, &dev->gadget);
+	retval = usb_add_gadget_udc_release(&pdev->dev, &dev->gadget,
+			gadget_release);
 	if (retval)
 		goto err;