libdcdb: fixed a Cassandra-related memory leak on sensor-publish ops

lib/src/sensorconfig.cpp

@@ -963,7 +963,6 @@ SCError SensorConfigImpl::getPublicSensorByName(PublicSensor& sensor, const char
             const CassValue* opSet = nullptr;
             CassIterator *opSetIt = nullptr;
             if((opSet=cass_row_get_column_by_name(row, "operations")) && (opSetIt=cass_iterator_from_collection(opSet))) {
-                CassIterator *opSetIt = cass_iterator_from_collection(opSet);
                 const char *opString;
                 size_t opLen;
 
@@ -1495,6 +1494,8 @@ SCError SensorConfigImpl::setOperations(std::string publicName, std::set<std::st
     rc = cass_future_error_code(future);
     if (rc != CASS_OK) {
         connection->printError(future);
+        cass_future_free(future);
+        cass_collection_free(cassSet);
         return SC_UNKNOWNERROR;
     }
     
@@ -1517,7 +1518,8 @@ SCError SensorConfigImpl::setOperations(std::string publicName, std::set<std::st
     else {
         error = SC_OK;
     }
-    
+
+    cass_future_free(future);
     cass_statement_free(statement);
     cass_prepared_free(prepared);
     cass_collection_free(cassSet);