Fixed warning by using correct type to save viewport.
Fixed warning by using correct type to save viewport.

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