Fix issues found by FindBugs: DM_NUMBER_CTOR

http://findbugs.sourceforge.net/bugDescriptions.html#DM_NUMBER_CTOR

Change-Id: I4c89b5a9b43fae0e36899d0e73c9f1ab7b1943d4
diff --git a/src/main/java/net/onrc/onos/core/linkdiscovery/NodePortTuple.java b/src/main/java/net/onrc/onos/core/linkdiscovery/NodePortTuple.java
index c586ecc..4b44446 100644
--- a/src/main/java/net/onrc/onos/core/linkdiscovery/NodePortTuple.java
+++ b/src/main/java/net/onrc/onos/core/linkdiscovery/NodePortTuple.java
@@ -55,7 +55,7 @@
     }
 
     public String toString() {
-        return "[id=" + HexString.toHexString(nodeId) + ", port=" + new Short(portId) + "]";
+        return "[id=" + HexString.toHexString(nodeId) + ", port=" + portId + "]";
     }
 
     @Override