drm: gm12u320: Add -ENODEV to list of errors to ignore

Add -ENODEV to the list of usb-transfer errors which we ignore to
avoid logging Frame update errors when the device gets unplugged.

Acked-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190811143725.5951-2-hdegoede@redhat.com

drivers/gpu/drm/tiny/gm12u320.c

@@ -422,7 +422,7 @@ static void gm12u320_fb_update_work(struct work_struct *work)
 	return;
 err:
 	/* Do not log errors caused by module unload or device unplug */
-	if (ret != -ECONNRESET && ret != -ESHUTDOWN)
+	if (ret != -ENODEV && ret != -ECONNRESET && ret != -ESHUTDOWN)
 		GM12U320_ERR("Frame update error: %d\n", ret);
 }