correction thx to bboeckel && jpouderoux

Utilities/Python/vtkPython.h

@@ -142,11 +142,9 @@ public:
   vtkPythonScopeGilEnsurer(bool force = false)
     {
 #ifdef VTK_PYTHON_FULL_THREADSAFE
-    this->Force = force;
-    this->Force = true;
-#else    
-    this->Force = force;
+    force = true;
 #endif
+    this->Force = force;
     if (this->Force)
       {
       this->State = PyGILState_Ensure();

Utilities/PythonInterpreter/vtkPythonInterpreter.cxx

@@ -143,14 +143,11 @@ bool vtkPythonInterpreter::Initialize(int initsigs /*=0*/)
 
   if (!vtkPythonInterpreter::InitializedOnce)
     {
-#ifndef VTK_NO_PYTHON_THREADS
-    int threadInit = PyEval_ThreadsInitialized();
-    PyEval_InitThreads(); // safe to call this multiple time
-#endif
-
     vtkPythonInterpreter::InitializedOnce = true;
 
 #ifndef VTK_NO_PYTHON_THREADS
+    int threadInit = PyEval_ThreadsInitialized();
+    PyEval_InitThreads(); // safe to call this multiple time
     if(!threadInit)
       {
       PyEval_SaveThread(); // release GIL

Wrapping/PythonCore/vtkSmartPyObject.cxx

@@ -42,10 +42,6 @@ vtkSmartPyObject::~vtkSmartPyObject()
     vtkPythonScopeGilEnsurer gilEnsurer;
     Py_XDECREF(this->Object);
     }
-  else
-    {
-    Py_XDECREF(this->Object);
-    }
 }
 
 //--------------------------------------------------------------------