rather than twice, once implicitly from TraverseCXXDestructorDecl and
explicitly from VisitCXXDestructorDecl

Change-Id: I62a794faa530f2b54b82c86de0629afa28f30091
Reviewed-on: https://gerrit.libreoffice.org/27139Reviewed-by: Noel Grandin <noelgrandin@gmail.com>
Tested-by: Noel Grandin <noelgrandin@gmail.com>