fix valgrind issue with lte-bearer test

src/devices/lte/model/lte-mac-queue.cc

@@ -99,6 +99,7 @@ LteMacQueue::LteMacQueue (uint32_t maxSize)
 
 LteMacQueue::~LteMacQueue (void)
 {
+  m_queue.clear ();
 }
 
 

src/devices/lte/test/lte-bearer-test.cc

@@ -102,7 +102,10 @@ Ns3LteBearerTestCase::DoRun (void)
       return true; // the queue should be empty
     }
 
-
+  // Free memory; handle reference cycle that bearer has with RlcEntity 
+  bearer->Dispose ();
+  bearer = 0;
+  Simulator::Destroy ();
 
   return (testResult);
 }