Fix unused variable warnings that appear when using vtkDebug macro.
Fix unused variable warnings that appear when using vtkDebug macro.

keithroe/vtkoptix,spthaolt/VTK,hendradarwin/VTK,sankhesh/VTK,mspark93/VTK,sankhesh/VTK,keithroe/vtkoptix,candy7393/VTK,johnkit/vtk-dev,johnkit/vtk-dev,msmolens/VTK,sumedhasingla/VTK,mspark93/VTK,hendradarwin/VTK,gram526/VTK,spthaolt/VTK,berendkleinhaneveld/VTK,gram526/VTK,msmolens/VTK,msmolens/VTK,keithroe/vtkoptix,berendkleinhaneveld/VTK,collects/VTK,spthaolt/VTK,hendradarwin/VTK,SimVascular/VTK,berendkleinhaneveld/VTK,biddisco/VTK,collects/VTK,sumedhasingla/VTK,sumedhasingla/VTK,ashray/VTK-EVM,sumedhasingla/VTK,demarle/VTK,aashish24/VTK-old,demarle/VTK,sankhesh/VTK,sankhesh/VTK,collects/VTK,cjh1/VTK,berendkleinhaneveld/VTK,SimVascular/VTK,keithroe/vtkoptix,gram526/VTK,sankhesh/VTK,demarle/VTK,berendkleinhaneveld/VTK,mspark93/VTK,candy7393/VTK,sumedhasingla/VTK,msmolens/VTK,aashish24/VTK-old,sankhesh/VTK,hendradarwin/VTK,berendkleinhaneveld/VTK,msmolens/VTK,sumedhasingla/VTK,jmerkow/VTK,jmerkow/VTK,keithroe/vtkoptix,cjh1/VTK,gram526/VTK,SimVascular/VTK,hendradarwin/VTK,cjh1/VTK,johnkit/vtk-dev,keithroe/vtkoptix,collects/VTK,keithroe/vtkoptix,candy7393/VTK,mspark93/VTK,biddisco/VTK,candy7393/VTK,candy7393/VTK,candy7393/VTK,SimVascular/VTK,aashish24/VTK-old,gram526/VTK,demarle/VTK,hendradarwin/VTK,ashray/VTK-EVM,biddisco/VTK,daviddoria/PointGraphsPhase1,sumedhasingla/VTK,cjh1/VTK,candy7393/VTK,demarle/VTK,daviddoria/PointGraphsPhase1,spthaolt/VTK,SimVascular/VTK,jmerkow/VTK,sumedhasingla/VTK,gram526/VTK,biddisco/VTK,spthaolt/VTK,gram526/VTK,jmerkow/VTK,johnkit/vtk-dev,daviddoria/PointGraphsPhase1,msmolens/VTK,ashray/VTK-EVM,mspark93/VTK,mspark93/VTK,ashray/VTK-EVM,spthaolt/VTK,collects/VTK,demarle/VTK,jmerkow/VTK,berendkleinhaneveld/VTK,johnkit/vtk-dev,jmerkow/VTK,jmerkow/VTK,johnkit/vtk-dev,aashish24/VTK-old,SimVascular/VTK,hendradarwin/VTK,aashish24/VTK-old,SimVascular/VTK,daviddoria/PointGraphsPhase1,msmolens/VTK,collects/VTK,johnkit/vtk-dev,daviddoria/PointGraphsPhase1,aashish24/VTK-old,spthaolt/VTK,mspark93/VTK,demarle/VTK,demarle/VTK,jmerkow/VTK,ashray/VTK-EVM,gram526/VTK,biddisco/VTK,sankhesh/VTK,SimVascular/VTK,sankhesh/VTK,msmolens/VTK,daviddoria/PointGraphsPhase1,ashray/VTK-EVM,ashray/VTK-EVM,ashray/VTK-EVM,candy7393/VTK,cjh1/VTK,mspark93/VTK,keithroe/vtkoptix,biddisco/VTK,cjh1/VTK,biddisco/VTK