D13559: Fix some of cppcheck warnings

[Bhushan Shah]

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REVISION SUMMARY
  - selfInitialization
  - memleak
  
  I could probably suppress the selfInitialization warning, but probably
  is cleaner this way. Opinions welcome

TEST PLAN
  - arc lint --everything
  - Fix issues
  - build
  - run tests

REPOSITORY
  R127 KWayland

BRANCH
  fix-cppcheck

REVISION DETAIL
  https://phabricator.kde.org/D13559

AFFECTED FILES
  autotests/server/test_display.cpp
  src/client/xdgoutput.cpp
  src/server/dpms_interface.cpp
  src/server/xdgoutput_interface.cpp

To: bshah, #frameworks
Cc: kde-frameworks-devel, michaelh, ngraham, bruns
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