ARM: OMAP2+: display: Fix refcount leak bug

In omapdss_init_fbdev(), of_find_node_by_name() will return a node
pointer with refcount incremented. We should use of_node_put() when
it is not used anymore.
Signed-off-by: Liang He <windhl@126.com>
Message-Id: <20220617145803.4050918-1-windhl@126.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/mach-omap2/display.c

@@ -211,6 +211,7 @@ static int __init omapdss_init_fbdev(void)
 	node = of_find_node_by_name(NULL, "omap4_padconf_global");
 	if (node)
 		omap4_dsi_mux_syscon = syscon_node_to_regmap(node);
+	of_node_put(node);
 
 	return 0;
 }