clk: imx8mn: Add missing of_node_put()

After finishing using device node got from of_find_compatible_node(),
of_node_put() needs to be called.
Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Reviewed-by: Stephen Boyd <sboyd@kernel.org>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

drivers/clk/imx/clk-imx8mn.c

@@ -317,6 +317,7 @@ static int imx8mn_clocks_probe(struct platform_device *pdev)
 
 	np = of_find_compatible_node(NULL, NULL, "fsl,imx8mn-anatop");
 	base = of_iomap(np, 0);
+	of_node_put(np);
 	if (WARN_ON(!base)) {
 		ret = -ENOMEM;
 		goto unregister_hws;