Remove a warning that show up in paraview

Florian Maurinrequested to merge
florian360/vtk:warning_fix into master

This remove the following warning in Paraview https://open.cdash.org/viewBuildError.php?type=1&buildid=6594318

@cory.quammen

Backport: paraview/release

Edited by Florian Maurin

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