D17678: Use qobject_cast instead of dynamic_cast

[David Edmundson]

davidedmundson accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R241 KIO

REVISION DETAIL
  https://phabricator.kde.org/D17678

To: broulik, davidedmundson, dfaure, chinmoyr
Cc: kde-frameworks-devel, michaelh, ngraham, bruns
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