D24404: Small performance improvements suggested by clang-tidy

[Dominik Haumann]

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

REPOSITORY
  R216 Syntax Highlighting

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D24404

To: aacid, dhaumann
Cc: kwrite-devel, kde-frameworks-devel, LeGast00n, GB_2, domson, michaelh, ngraham, bruns, demsking, cullmann, sars, dhaumann
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