[BUG] fixed error checking in vtkCoreGraphicsGPUInfoList::Probe
[BUG] fixed error checking in vtkCoreGraphicsGPUInfoList::Probe

in one case, error code was being ignored; in another, the returned by-reference value was consulted without first checking the error code.

Change-Id: If684e6e576cd626922d63f5e1492da1687c99d82

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