D8779: Avoid hypothetical crash if output->init fails

[Martin Flöser]

graesslin requested changes to this revision.
This revision now requires changes to proceed.

REPOSITORY
  R108 KWin

REVISION DETAIL
  https://phabricator.kde.org/D8779

To: davidedmundson, #plasma, graesslin
Cc: plasma-devel, kwin, #kwin, bwowk, ZrenBot, progwolff, lesliezhai, ali-mohamed, hardening, jensreuterberg, abetts, sebas, apol, mart
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