D21456: Fix a crash due to weird refcount messup during stack unwinding

[Daniel Vrátil]

dvratil added a reviewer: KDE PIM.

REPOSITORY
  R165 Akonadi

REVISION DETAIL
  https://phabricator.kde.org/D21456

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