eliminate unused variable warning
eliminate unused variable warning

Change-Id: I45a40f94ee78f3a696bfebdd66374aa4d4be0dbd

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