D21085: Fix crash due to dangling reference

Fabian Vogt <[email protected]>
Newsgroups gmane.comp.kde.devel.kwin
Message-ID <[email protected]> 
fvogt created this revision.
fvogt added a reviewer: KWin.
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REVISION SUMMARY
  Returning a reference to a value on the stack is broken.
  This caused kwin_wayland to crash in openQA with a nullptr deref.
  
  BUG: 407199

TEST PLAN
  Only build tested.

REPOSITORY
  R108 KWin

BRANCH
  fi

REVISION DETAIL
  https://phabricator.kde.org/D21085

AFFECTED FILES
  plugins/platforms/drm/drm_output.cpp
  plugins/platforms/drm/drm_output.h

To: fvogt, #kwin
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