D16020: KFilePlacesModel: fix previous commit to avoid duplicating devices

[David Faure]

dfaure created this revision.
dfaure added a reviewer: jtamate.
Herald added a project: Frameworks.
Herald edited subscribers, added: kde-frameworks-devel; removed: Frameworks.
dfaure requested review of this revision.

TEST PLAN
  kfileplacesmodeltest

REPOSITORY
  R241 KIO

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D16020

AFFECTED FILES
  autotests/kfileplacesmodeltest.cpp
  src/filewidgets/kfileplacesmodel.cpp

To: dfaure, jtamate
Cc: kde-frameworks-devel, michaelh, ngraham, bruns
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