soc: sifive: ccache: fix missing of_node_put() in sifive_ccache_init()

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

Fixes: a967a289 ("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>

drivers/soc/sifive/sifive_ccache.c

@@ -215,12 +215,16 @@ static int __init sifive_ccache_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;
+	}
 
 	ccache_base = ioremap(res.start, resource_size(&res));
-	if (!ccache_base)
-		return -ENOMEM;
+	if (!ccache_base) {
+		rc = -ENOMEM;
+		goto err_node_put;
+	}
 
 	if (of_property_read_u32(np, "cache-level", &level)) {
 		rc = -ENOENT;
@@ -243,6 +247,7 @@ static int __init sifive_ccache_init(void)
 			goto err_free_irq;
 		}
 	}
+	of_node_put(np);
 
 	ccache_config_read();
 
@@ -259,6 +264,8 @@ static int __init sifive_ccache_init(void)
 		free_irq(g_irq[i], NULL);
 err_unmap:
 	iounmap(ccache_base);
+err_node_put:
+	of_node_put(np);
 	return rc;
 }