COMP: Fix clang warning "unused result" and "memset with zero size".
COMP: Fix clang warning "unused result" and "memset with zero size".

Signed-off-by: David Gobbi <36eb1dd469a42e6d4ec39abe0ba025f5ed86133c@gmail.com>

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