irqchip/gic/realview: Fix refcount leak in realview_gic_of_init

stable inclusion
from stable-4.19.249
commit b634af84bc1edece4e63317b0ad95618dd3a8693
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I5I4FP
CVE: NA

--------------------------------

[ Upstream commit f4b98e31 ]

of_find_matching_node_and_match() returns a node pointer with refcount
incremented, we should use of_node_put() on it when not need anymore.
Add missing of_node_put() to avoid refcount leak.

Fixes: 82b0a434 ("irqchip/gic/realview: Support more RealView DCC variants")
Signed-off-by: NMiaoqian Lin <linmq006@gmail.com>
Signed-off-by: NMarc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20220601080930.31005-2-linmq006@gmail.comSigned-off-by: NSasha Levin <sashal@kernel.org>
Signed-off-by: NYongqiang Liu <liuyongqiang13@huawei.com>

drivers/irqchip/irq-gic-realview.c

@@ -57,6 +57,7 @@ realview_gic_of_init(struct device_node *node, struct device_node *parent)
 
 	/* The PB11MPCore GIC needs to be configured in the syscon */
 	map = syscon_node_to_regmap(np);
+	of_node_put(np);
 	if (!IS_ERR(map)) {
 		/* new irq mode with no DCC */
 		regmap_write(map, REALVIEW_SYS_LOCK_OFFSET,