Crashes after the VNC client disconnect

Signed-off-by: Roman Savochenko <roman@home.home>

libvncserver/main.cpp

@@ -1098,14 +1098,14 @@ void rfbScreenCleanup(rfbScreenInfoPtr screen)
   rfbReleaseClientIterator(i);
 
   if (mOnHoldClientHandlerThread) {
-    mOnHoldClientHandlerThread->exit();
+    //mOnHoldClientHandlerThread->exit();
     delete mOnHoldClientHandlerThread;
     mOnHoldClientHandlerThread = NULL;
     delete mOnHoldClientHandler;
     mOnHoldClientHandler = NULL;
   }
   if (mControlPipeHandlerThread) {
-    mControlPipeHandlerThread->exit();
+    //mControlPipeHandlerThread->exit();
     delete mControlPipeHandlerThread;
     mControlPipeHandlerThread = NULL;
     delete mControlPipeHandler;