Add finalize to clean up file handles to Titan
diff --git a/src/main/java/net/floodlightcontroller/linkdiscovery/web/TopoLinksResource.java b/src/main/java/net/floodlightcontroller/linkdiscovery/web/TopoLinksResource.java
index 323708e..a0770cb 100644
--- a/src/main/java/net/floodlightcontroller/linkdiscovery/web/TopoLinksResource.java
+++ b/src/main/java/net/floodlightcontroller/linkdiscovery/web/TopoLinksResource.java
@@ -13,8 +13,8 @@
     public List<Link> retrieve() {
 		TopoLinkServiceImpl impl = new TopoLinkServiceImpl();
 		
-		return impl.GetActiveLinks();
-		
+		List<Link> retval = impl.GetActiveLinks();
+		return retval;
 	}
 
 }