fix unused variable warning
fix unused variable warning

Change-Id: Ibf6a58a7eab468d1fe651589381402ed22edd432

keithroe/vtkoptix,gram526/VTK,gram526/VTK,msmolens/VTK,jmerkow/VTK,sumedhasingla/VTK,biddisco/VTK,johnkit/vtk-dev,biddisco/VTK,msmolens/VTK,johnkit/vtk-dev,collects/VTK,collects/VTK,sankhesh/VTK,demarle/VTK,johnkit/vtk-dev,aashish24/VTK-old,SimVascular/VTK,berendkleinhaneveld/VTK,msmolens/VTK,ashray/VTK-EVM,sankhesh/VTK,gram526/VTK,keithroe/vtkoptix,aashish24/VTK-old,jmerkow/VTK,SimVascular/VTK,collects/VTK,hendradarwin/VTK,collects/VTK,keithroe/vtkoptix,gram526/VTK,gram526/VTK,ashray/VTK-EVM,sumedhasingla/VTK,SimVascular/VTK,msmolens/VTK,jmerkow/VTK,hendradarwin/VTK,msmolens/VTK,demarle/VTK,candy7393/VTK,SimVascular/VTK,biddisco/VTK,berendkleinhaneveld/VTK,SimVascular/VTK,sumedhasingla/VTK,keithroe/vtkoptix,demarle/VTK,candy7393/VTK,SimVascular/VTK,hendradarwin/VTK,sumedhasingla/VTK,SimVascular/VTK,aashish24/VTK-old,collects/VTK,gram526/VTK,hendradarwin/VTK,candy7393/VTK,sumedhasingla/VTK,sumedhasingla/VTK,sankhesh/VTK,demarle/VTK,ashray/VTK-EVM,keithroe/vtkoptix,candy7393/VTK,msmolens/VTK,berendkleinhaneveld/VTK,candy7393/VTK,jmerkow/VTK,biddisco/VTK,mspark93/VTK,sankhesh/VTK,aashish24/VTK-old,berendkleinhaneveld/VTK,mspark93/VTK,demarle/VTK,ashray/VTK-EVM,ashray/VTK-EVM,mspark93/VTK,candy7393/VTK,ashray/VTK-EVM,candy7393/VTK,mspark93/VTK,biddisco/VTK,SimVascular/VTK,sankhesh/VTK,sumedhasingla/VTK,aashish24/VTK-old,demarle/VTK,keithroe/vtkoptix,mspark93/VTK,sankhesh/VTK,keithroe/vtkoptix,jmerkow/VTK,berendkleinhaneveld/VTK,johnkit/vtk-dev,berendkleinhaneveld/VTK,johnkit/vtk-dev,johnkit/vtk-dev,sankhesh/VTK,gram526/VTK,jmerkow/VTK,aashish24/VTK-old,ashray/VTK-EVM,mspark93/VTK,hendradarwin/VTK,collects/VTK,msmolens/VTK,ashray/VTK-EVM,demarle/VTK,keithroe/vtkoptix,hendradarwin/VTK,hendradarwin/VTK,demarle/VTK,biddisco/VTK,jmerkow/VTK,gram526/VTK,johnkit/vtk-dev,biddisco/VTK,mspark93/VTK,msmolens/VTK,sumedhasingla/VTK,berendkleinhaneveld/VTK,mspark93/VTK,jmerkow/VTK,candy7393/VTK,sankhesh/VTK