BUG: fixed signed integer overflow by switching to unsigned int
BUG: fixed signed integer overflow by switching to unsigned int

Change-Id: I5e0b2b8e02fe17ddc5617a596d31137e9b77f47c

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