D13559: Fix some of cppcheck warnings

[Bhushan Shah]

This revision was automatically updated to reflect the committed changes.
Closed by commit R127:84bc3cbd6102: Fix some of cppcheck warnings (authored by bshah).

REPOSITORY
  R127 KWayland

CHANGES SINCE LAST UPDATE
  https://phabricator.kde.org/D13559?vs=37088&id=37135

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, aacid
Cc: apol, aacid, kde-frameworks-devel, michaelh, ngraham, bruns
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