THRIFT-798. cpp: Reduce resource leakage by TNonblockingServer destructor

git-svn-id: https://svn.apache.org/repos/asf/incubator/thrift/trunk@991980 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/lib/cpp/src/server/TNonblockingServer.h b/lib/cpp/src/server/TNonblockingServer.h
index 70f46c6..2dd5362 100644
--- a/lib/cpp/src/server/TNonblockingServer.h
+++ b/lib/cpp/src/server/TNonblockingServer.h
@@ -243,7 +243,7 @@
     setThreadManager(threadManager);
   }
 
-  ~TNonblockingServer() {}
+  ~TNonblockingServer();
 
   void setThreadManager(boost::shared_ptr<ThreadManager> threadManager);