D12887: Fix a compilation warning

[Aleix Pol Gonzalez]

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

REPOSITORY
  R321 KStars

REVISION DETAIL
  https://phabricator.kde.org/D12887

To: ckertesz, mutlaqja, apol
Cc: kde-edu, narvaez, apol
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