fix hanging test_xmlrpc
diff --git a/Lib/test/test_xmlrpc.py b/Lib/test/test_xmlrpc.py
index 8325496..b9103fa 100644
--- a/Lib/test/test_xmlrpc.py
+++ b/Lib/test/test_xmlrpc.py
@@ -320,7 +320,7 @@
     def tearDown(self):
         # wait on the server thread to terminate
         self.evt.wait(4.0)
-        if not self.evt.isSet():
+        if not self.evt.is_set():
             self.evt.set()
             stop_serving()
             raise RuntimeError("timeout reached, test has failed")