Handling portnum correctly in portstats reply when serializing for json

in response to a rest call

src/main/java/org/openflow/protocol/statistics/OFPortStatisticsReply.java

 /**
 *    Copyright (c) 2008 The Board of Trustees of The Leland Stanford Junior
 *    University
-* 
+*
 *    Licensed under the Apache License, Version 2.0 (the "License"); you may
 *    not use this file except in compliance with the License. You may obtain
 *    a copy of the License at
@@ -18,7 +18,10 @@
 package org.openflow.protocol.statistics;
 
 
+import net.floodlightcontroller.core.web.serializers.UShortSerializer;
+
 import org.codehaus.jackson.annotate.JsonIgnore;
+import org.codehaus.jackson.map.annotate.JsonSerialize;
 import org.jboss.netty.buffer.ChannelBuffer;
 
 /**
@@ -43,6 +46,7 @@ public class OFPortStatisticsReply implements OFStatistics {
     /**
      * @return the portNumber
      */
+    @JsonSerialize(using=UShortSerializer.class)
     public short getPortNumber() {
         return portNumber;
     }