D10918: taglibextractor: Refactor for better readability

[Michael Heidelbach]

michaelh created this revision.
michaelh added reviewers: mgallien, Baloo, Frameworks.
michaelh added a project: Frameworks.
Restricted Application added a project: Baloo.
michaelh requested review of this revision.

REVISION SUMMARY
  - Use const where applicable

TEST PLAN
  make test

REPOSITORY
  R286 KFileMetaData

BRANCH
  taglibextractor (branched from master)

REVISION DETAIL
  https://phabricator.kde.org/D10918

AFFECTED FILES
  src/extractors/taglibextractor.cpp
  src/extractors/taglibextractor.h

To: michaelh, mgallien, #baloo, #frameworks
Cc: ashaposhnikov, michaelh, spoorun, nicolasfella, alexeymin
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