drm/fsl-dcu: 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, but current code only
calls it at error path, fix it by adding it at correct code path.

Signed-off-by: Peter Chen <peter.chen@nxp.com>
Signed-off-by: Stefan Agner <stefan@agner.ch>

drivers/gpu/drm/fsl-dcu/fsl_tcon.c

@@ -92,6 +92,7 @@ struct fsl_tcon *fsl_tcon_init(struct device *dev)
 		goto err_node_put;
 	}
 
+	of_node_put(np);
 	clk_prepare_enable(tcon->ipg_clk);
 
 	dev_info(dev, "Using TCON in bypass mode\n");