gpu: drm: sun4i_drv: add missing of_node_put after calling of_parse_phandle

of_node_put needs to be called when the device node which is got
from of_parse_phandle has finished using.

Cc: Maxime Ripard <maxime.ripard@free-electrons.com>
Cc: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: NPeter Chen <peter.chen@nxp.com>
Signed-off-by: NMaxime Ripard <maxime.ripard@free-electrons.com>

drivers/gpu/drm/sun4i/sun4i_drv.c

@@ -310,6 +310,7 @@ static int sun4i_drv_probe(struct platform_device *pdev)
 
 		count += sun4i_drv_add_endpoints(&pdev->dev, &match,
 						pipeline);
+		of_node_put(pipeline);
 
 		DRM_DEBUG_DRIVER("Queued %d outputs on pipeline %d\n",
 				 count, i);