D27158: Fix some compiler warnings

[David Faure]

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

REPOSITORY
  R237 KConfig

BRANCH
  l-compiler-warnings (branched from master)

REVISION DETAIL
  https://phabricator.kde.org/D27158

To: ahmadsamir, #frameworks, dfaure, apol
Cc: kde-frameworks-devel, LeGast00n, cblack, GB_2, michaelh, ngraham, bruns
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