WRG: fix a warning raised by OTBIce:

the prototype of the function is not compatible with the original function into itk:ProcessObject

Code/BasicFilters/otbListSampleToHistogramListGenerator.h

@@ -146,7 +146,7 @@ protected:
   ListSampleToHistogramListGenerator();
   virtual ~ListSampleToHistogramListGenerator() {}
   void GenerateData();
-  DataObjectPointer MakeOutput(unsigned int idx);
+  DataObjectPointer MakeOutput(DataObjectPointerArraySizeType idx);
   void PrintSelf(std::ostream& os, itk::Indent indent) const;
 
 private:

Code/BasicFilters/otbListSampleToHistogramListGenerator.txx

@@ -90,7 +90,7 @@ template<class TListSample, class THistogramMeasurement, class TFrequencyContain
 typename ListSampleToHistogramListGenerator<TListSample,THistogramMeasurement, TFrequencyContainer>
 ::DataObjectPointer
 ListSampleToHistogramListGenerator<TListSample,THistogramMeasurement, TFrequencyContainer>
-::MakeOutput(unsigned int idx)
+::MakeOutput(DataObjectPointerArraySizeType idx)
 {
   DataObjectPointer output;
   output = static_cast<itk::DataObject*>(HistogramListType::New().GetPointer());