D16559: Fix unused-object warnings

[Denis Kurz]

dkurz marked an inline comment as done.

REPOSITORY
  R165 Akonadi

REVISION DETAIL
  https://phabricator.kde.org/D16559

To: dkurz, #kde_pim, mlaurent
Cc: mlaurent, kde-pim, dvasin, rodsevich, winterz, vkrause, knauss, dvratil
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