Bug fix for XOS integration

Change-Id: I51213df3304e9ee820da2d3f77e92b30a1473954
diff --git a/apps/xos-integration/src/main/java/org/onosproject/xosintegration/OnosXOSIntegrationManager.java b/apps/xos-integration/src/main/java/org/onosproject/xosintegration/OnosXOSIntegrationManager.java
index 8ff1186..48bfe77 100644
--- a/apps/xos-integration/src/main/java/org/onosproject/xosintegration/OnosXOSIntegrationManager.java
+++ b/apps/xos-integration/src/main/java/org/onosproject/xosintegration/OnosXOSIntegrationManager.java
@@ -152,6 +152,7 @@
         nodeToPort.put("cordcompute02.onlab.us", new ConnectPoint(FABRIC_DEVICE_ID,
                                                                   PortNumber.portNumber(3)));
 
+        portToVlan = Maps.newHashMap();
         portToVlan.putIfAbsent(2L, (short) 201);
         portToVlan.putIfAbsent(6L, (short) 401);
     }