Tried to release resources from child thread

pdns.c

@@ -367,6 +367,11 @@ eprintf("thread %u exiting at %f seconds", ndx, (double)ms/1000.);
       /* Let the main thread know we are ready to join */
       ES_VSignal(S.tid, ndx);
 
+   /* Free resources for this thread */
+   // JDR Wed 04 Dec 2019 11:52:15 AM EST
+   // This causes a double free() error, so let it leak for now.
+//   ES_cleanup();
+
    return NULL;
 }