MIPS: Loongson64: Add missing of_node_put() in ls2k_reset_init()

This node pointer is returned by of_find_compatible_node() with
refcount incremented in ls2k_reset_init(). Calling of_node_put()
to aovid the refcount leak.

Fixes: 7eb7819a ("MIPS: Loongson64: Add Loongson-2K1000 reset platform driver")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

drivers/platform/mips/ls2k-reset.c

@@ -38,6 +38,7 @@ static int ls2k_reset_init(void)
 	}
 
 	base = of_iomap(np, 0);
+	of_node_put(np);
 	if (!base) {
 		pr_info("Failed to map PM register base address\n");
 		return -ENOMEM;
@@ -46,7 +47,6 @@ static int ls2k_reset_init(void)
 	_machine_restart = ls2k_restart;
 	pm_power_off = ls2k_poweroff;
 
-	of_node_put(np);
 	return 0;
 }