soc: sifive: l2_cache: fix missing of_node_put() in sifive_l2_init()

commit 8fbf94fea0 upstream.

The device_node pointer returned by of_find_matching_node() with
refcount incremented, when finish using it, the refcount need be
decreased.

Fixes: a967a289f1 ("RISC-V: sifive_l2_cache: Add L2 cache controller driver for SiFive SoCs")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
[conor: cache -> l2_cache]
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/soc/sifive/sifive_l2_cache.c

@@ -202,12 +202,16 @@ static int __init sifive_l2_init(void)
 	if (!np)
 		return -ENODEV;
 
-	if (of_address_to_resource(np, 0, &res))
-		return -ENODEV;
+	if (of_address_to_resource(np, 0, &res)) {
+		rc = -ENODEV;
+		goto err_node_put;
+	}
 
 	l2_base = ioremap(res.start, resource_size(&res));
-	if (!l2_base)
-		return -ENOMEM;
+	if (!l2_base) {
+		rc = -ENOMEM;
+		goto err_node_put;
+	}
 
 	intr_num = of_property_count_u32_elems(np, "interrupts");
 	if (!intr_num) {
@@ -224,6 +228,7 @@ static int __init sifive_l2_init(void)
 			goto err_free_irq;
 		}
 	}
+	of_node_put(np);
 
 	l2_config_read();
 
@@ -240,6 +245,8 @@ err_free_irq:
 		free_irq(g_irq[i], NULL);
 err_unmap:
 	iounmap(l2_base);
+err_node_put:
+	of_node_put(np);
 	return rc;
 }
 device_initcall(sifive_l2_init);