D10771: Save some memory allocations by using the right API

[Aleix Pol Gonzalez]

apol created this revision.
apol added a reviewer: Frameworks.
Restricted Application added a project: Frameworks.
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TEST PLAN
  tests pass

REPOSITORY
  R237 KConfig

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D10771

AFFECTED FILES
  src/core/kconfig.cpp

To: apol, #frameworks
Cc: michaelh
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