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

[Volker Krause]

vkrause accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R165 Akonadi

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

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