Fixed: use-after-free on deleted mouse pointer

--HG--
branch : develop

code/ryzom/client/src/interface_v3/interface_manager.cpp

@@ -1381,6 +1381,8 @@ void CInterfaceManager::uninitInGame1 ()
 	reset();
 	CInterfaceLink::removeAllLinks();
 
+	CWidgetManager::getInstance()->setPointer( NULL );
+
 	// Release DDX manager, before DB remove
 	CDDXManager::getInstance()->release();