Fix for ONOS-7708 java.lang.ClassCastException while calling the API to get OvsdbQueue.

Change-Id: Ib67f33483f870a775d8fa73fe7aa531b97c8e1e6
diff --git a/protocols/ovsdb/api/src/main/java/org/onosproject/ovsdb/controller/driver/DefaultOvsdbClient.java b/protocols/ovsdb/api/src/main/java/org/onosproject/ovsdb/controller/driver/DefaultOvsdbClient.java
index 768addf..17d931f 100644
--- a/protocols/ovsdb/api/src/main/java/org/onosproject/ovsdb/controller/driver/DefaultOvsdbClient.java
+++ b/protocols/ovsdb/api/src/main/java/org/onosproject/ovsdb/controller/driver/DefaultOvsdbClient.java
@@ -1705,11 +1705,10 @@
         }
 
         OvsdbSet dscpOvsdbSet = ((OvsdbSet) queue.getDscpColumn().data());
-        @SuppressWarnings("unchecked")
-        Set<String> dscpSet = dscpOvsdbSet.set();
+        Set dscpSet = dscpOvsdbSet.set();
         Long dscp = null;
         if (dscpSet != null && !dscpSet.isEmpty()) {
-            dscp = Long.valueOf((String) dscpSet.toArray()[0]);
+            dscp = Long.valueOf(dscpSet.toArray()[0].toString());
         }
 
         Map<String, String> otherConfigs;