D24406: Small performance improvements suggested by clang tidy

[Albert Astals Cid]

aacid created this revision.
Herald added projects: Frameworks, Baloo.
Herald added subscribers: Baloo, kde-frameworks-devel.
aacid requested review of this revision.

REPOSITORY
  R286 KFileMetaData

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D24406

AFFECTED FILES
  src/externalextractor.cpp
  src/externalwriter.cpp
  src/extractorcollection.cpp
  src/mimeutils.cpp

To: aacid
Cc: kde-frameworks-devel, #baloo, lots0logs, LeGast00n, fbampaloukas, GB_2, domson, ashaposhnikov, michaelh, astippich, spoorun, ngraham, bruns, abrahams
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