D24406: Small performance improvements suggested by clang tidy

[Albert Astals Cid]

This revision was automatically updated to reflect the committed changes.
Closed by commit R286:f510f3eca6a0: Small performance improvements suggested by clang tidy (authored by aacid).

REPOSITORY
  R286 KFileMetaData

CHANGES SINCE LAST UPDATE
  https://phabricator.kde.org/D24406?vs=67291&id=67328

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

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

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