fix memory leak
fix memory leak

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