Addressing too many values to unpack.

Change-Id: I412877110d37d41f0fa12ddde922fdd8b0816c87
diff --git a/voltha/adapters/tibit_olt/tibit_olt.py b/voltha/adapters/tibit_olt/tibit_olt.py
index 9b2964b..ce868f8 100644
--- a/voltha/adapters/tibit_olt/tibit_olt.py
+++ b/voltha/adapters/tibit_olt/tibit_olt.py
@@ -370,7 +370,7 @@
                                       type=inner_tag_and_rest.type) /\
                                       inner_tag_and_rest.payload
 
-                        _, logical_device_id = self.vlan_to_device_ids.get(cvid)
+                        _, logical_device_id, _ = self.vlan_to_device_ids.get(cvid)
                         if logical_device_id is None:
                             log.error('invalid-cvid', cvid=cvid)
                         else: