of: of_detach_node() remove unneeded local return variable

rc is unneeded, just return 0.
Signed-off-by: Ding Xiang <dingxiang@cmss.chinamobile.com>
Signed-off-by: Rob Herring <robh@kernel.org>

drivers/of/dynamic.c

@@ -286,7 +286,6 @@ int of_detach_node(struct device_node *np)
 {
 	struct of_reconfig_data rd;
 	unsigned long flags;
-	int rc = 0;
 
 	memset(&rd, 0, sizeof(rd));
 	rd.dn = np;
@@ -301,7 +300,7 @@ int of_detach_node(struct device_node *np)
 
 	of_reconfig_notify(OF_RECONFIG_DETACH_NODE, &rd);
 
-	return rc;
+	return 0;
 }
 EXPORT_SYMBOL_GPL(of_detach_node);