D11188: Fix use after free in RadialMap::Widget::invalidate()

[Harald Sitter]

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

REPOSITORY
  R352 Filelight

REVISION DETAIL
  https://phabricator.kde.org/D11188

To: janus, sitter, sandsmark
Cc: kde-utils-devel
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