Silence clang static analyzer warning about null deref
Silence clang static analyzer warning about null deref

Add a return in addition to the existing vtkErrorMacro,
otherwise aa2/null would be dereferenced in the next
'if' statement.

Change-Id: Ide1751179e0894f5d5d0a083272a1042dbd20bb9

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