Fix coverity issue:

* CID 332682: Resource leak
* CID 350607: Resource leak
* CID 332677: Resource leak

src/Mod/Import/App/AppImportPy.cpp

@@ -780,7 +780,7 @@ static PyObject * importAssembly(PyObject *self, PyObject *args)
 
 PyObject* initModule()
 {
-    return (new Module)->module().ptr();
+    return Base::Interpreter().addModule(new Module);
 }
 
 } // namespace Import