Fix nni getting disabled issue

Change-Id: Ibf5205c0c7f0bc4ce869e410e3e17cc65082784f
diff --git a/voltha/adapters/openolt/openolt_data_model.py b/voltha/adapters/openolt/openolt_data_model.py
index f00994b..f48e0d6 100644
--- a/voltha/adapters/openolt/openolt_data_model.py
+++ b/voltha/adapters/openolt/openolt_data_model.py
@@ -272,7 +272,7 @@
         port_no, label = self._add_port(intf_id, port_type, oper_status)
 
         if intf_type == "nni":
-            self._add_logical_port(port_no, intf_id, oper)
+            self._add_logical_port(port_no, intf_id, oper_status)
 
     # #################
     # Private functions