D25039: Fix Clazy performance issues, const &

[Méven Car]

meven edited the summary of this revision.

REPOSITORY
  R241 KIO

REVISION DETAIL
  https://phabricator.kde.org/D25039

To: meven, #frameworks, dfaure
Cc: kossebau, kde-frameworks-devel, LeGast00n, GB_2, michaelh, ngraham, bruns
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