D22674: Fix some compiler warnings

[Aleix Pol Gonzalez]

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

REPOSITORY
  R159 KActivities Statistics

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D22674

To: meven, ivan, apol
Cc: kde-frameworks-devel, LeGast00n, sbergeron, michaelh, ngraham, bruns
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