D21036: KCalCore: Misc clang-tidy fixes

[Daniel Vrátil]

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

REVISION DETAIL
  https://phabricator.kde.org/D21036

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