D10927: Apply fixes to simple clazy warnings

[David Faure]

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

REPOSITORY
  R284 KCompletion

BRANCH
  clazyfixes

REVISION DETAIL
  https://phabricator.kde.org/D10927

To: fabiank, dfaure
Cc: #frameworks, michaelh
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