resolve unused variable warning
resolve unused variable warning

Change-Id: Iddce83001a39f53c423971f52e6dea07e09b8beb

candy7393/VTK,SimVascular/VTK,demarle/VTK,gram526/VTK,msmolens/VTK,gram526/VTK,demarle/VTK,biddisco/VTK,demarle/VTK,jmerkow/VTK,gram526/VTK,msmolens/VTK,SimVascular/VTK,candy7393/VTK,johnkit/vtk-dev,keithroe/vtkoptix,gram526/VTK,candy7393/VTK,gram526/VTK,mspark93/VTK,sankhesh/VTK,keithroe/vtkoptix,demarle/VTK,berendkleinhaneveld/VTK,biddisco/VTK,ashray/VTK-EVM,keithroe/vtkoptix,johnkit/vtk-dev,SimVascular/VTK,candy7393/VTK,berendkleinhaneveld/VTK,SimVascular/VTK,keithroe/vtkoptix,biddisco/VTK,sankhesh/VTK,hendradarwin/VTK,johnkit/vtk-dev,SimVascular/VTK,SimVascular/VTK,keithroe/vtkoptix,mspark93/VTK,ashray/VTK-EVM,biddisco/VTK,sankhesh/VTK,keithroe/vtkoptix,berendkleinhaneveld/VTK,SimVascular/VTK,berendkleinhaneveld/VTK,msmolens/VTK,ashray/VTK-EVM,berendkleinhaneveld/VTK,ashray/VTK-EVM,gram526/VTK,hendradarwin/VTK,biddisco/VTK,jmerkow/VTK,msmolens/VTK,mspark93/VTK,sumedhasingla/VTK,biddisco/VTK,ashray/VTK-EVM,demarle/VTK,msmolens/VTK,candy7393/VTK,sankhesh/VTK,berendkleinhaneveld/VTK,ashray/VTK-EVM,johnkit/vtk-dev,sumedhasingla/VTK,sankhesh/VTK,sumedhasingla/VTK,biddisco/VTK,mspark93/VTK,demarle/VTK,jmerkow/VTK,mspark93/VTK,jmerkow/VTK,sumedhasingla/VTK,sumedhasingla/VTK,gram526/VTK,jmerkow/VTK,jmerkow/VTK,demarle/VTK,hendradarwin/VTK,mspark93/VTK,sumedhasingla/VTK,hendradarwin/VTK,SimVascular/VTK,mspark93/VTK,berendkleinhaneveld/VTK,keithroe/vtkoptix,ashray/VTK-EVM,jmerkow/VTK,msmolens/VTK,johnkit/vtk-dev,demarle/VTK,hendradarwin/VTK,jmerkow/VTK,sankhesh/VTK,msmolens/VTK,hendradarwin/VTK,sankhesh/VTK,gram526/VTK,msmolens/VTK,candy7393/VTK,sankhesh/VTK,mspark93/VTK,sumedhasingla/VTK,sumedhasingla/VTK,ashray/VTK-EVM,keithroe/vtkoptix,hendradarwin/VTK,johnkit/vtk-dev,candy7393/VTK,johnkit/vtk-dev,candy7393/VTK