ethernet_interface: Fix vlan return object

Change-Id: I767561963c0669952fa9a2dd0086752110038fd3
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/src/ethernet_interface.cpp b/src/ethernet_interface.cpp
index 1830bcd..94a8b60 100644
--- a/src/ethernet_interface.cpp
+++ b/src/ethernet_interface.cpp
@@ -693,7 +693,7 @@
     writeConfigurationFile();
     manager.reloadConfigs();
 
-    return objPath;
+    return ret;
 }
 
 ServerList EthernetInterface::staticNTPServers(ServerList value)