mips: ralink: add missing of_node_put() call in ill_acc_of_setup()

of_find_compatible_node() takes a reference to the device_node
which needs to be dropped when done.
Signed-off-by: Wang Qing <wangqing@vivo.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

arch/mips/ralink/ill_acc.c

@@ -65,6 +65,7 @@ static int __init ill_acc_of_setup(void)
 	}
 
 	irq = irq_of_parse_and_map(np, 0);
+	of_node_put(np);
 	if (!irq) {
 		dev_err(&pdev->dev, "failed to get irq\n");
 		put_device(&pdev->dev);