D12578: fix some issues reported by clazy

[Stefan Brüns]

bruns requested changes to this revision.
This revision now requires changes to proceed.

REPOSITORY
  R293 Baloo

REVISION DETAIL
  https://phabricator.kde.org/D12578

To: mgallien, #baloo, #frameworks, bruns
Cc: bruns, ashaposhnikov, michaelh, astippich, spoorun
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