ARM: at91: pm: of_node_put() after its usage

Put node after it has been used.

Fixes: 13f16017 ("ARM: at91: pm: Tie the USB clock mask to the pmc")
Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/1596616610-15460-4-git-send-email-claudiu.beznea@microchip.com

arch/arm/mach-at91/pm.c

@@ -846,6 +846,7 @@ static void __init at91_pm_init(void (*pm_idle)(void))
 
 	pmc_np = of_find_matching_node_and_match(NULL, atmel_pmc_ids, &of_id);
 	soc_pm.data.pmc = of_iomap(pmc_np, 0);
+	of_node_put(pmc_np);
 	if (!soc_pm.data.pmc) {
 		pr_err("AT91: PM not supported, PMC not found\n");
 		return;