wifi: Do not peek packets if a container queue does not have a mask for

a given link

If no mask exists for the given link, it means packets of that container
queue cannot be sent on that link.

src/wifi/model/qos-txop.cc

@@ -394,7 +394,7 @@ QosTxop::PeekNextMpdu(uint8_t linkId, uint8_t tid, Mac48Address recipient, Ptr<c
         }
         WifiContainerQueueId queueId(WIFI_QOSDATA_QUEUE, WIFI_UNICAST, recipient, tid);
         if (auto mask = m_mac->GetMacQueueScheduler()->GetQueueLinkMask(m_ac, queueId, linkId);
-            !mask || mask->none())
+            mask && mask->none())
         {
             return m_queue->PeekByQueueId(queueId, mpdu);
         }