D6070: fix warnings from clazy with the default warning level

[Matthieu Gallien]

This revision was automatically updated to reflect the committed changes.
Closed by commit R286:187055408f59: fix warnings from clazy with the default warning level (authored by mgallien).

REPOSITORY
  R286 KFileMetaData

CHANGES SINCE LAST UPDATE
  https://phabricator.kde.org/D6070?vs=15104&id=15109

REVISION DETAIL
  https://phabricator.kde.org/D6070

AFFECTED FILES
  autotests/epubextractortest.cpp
  autotests/exiv2extractortest.cpp
  autotests/popplerextractortest.cpp
  autotests/taglibextractortest.cpp
  src/externalextractor.cpp
  src/externalextractor.h
  src/externalwriter.cpp
  src/externalwriter.h
  src/extractorcollection.cpp
  src/writedata.cpp
  src/writedata.h
  src/writer.h
  src/writer_p.h
  src/writercollection.cpp
  src/writercollection.h
  src/writers/taglibwriter.cpp

To: mgallien, #frameworks, dfaure
Cc: dfaure, apol
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