D23428: Remove change-set null check

[Roman Gilg]

romangg created this revision.
romangg added a reviewer: KWin.
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REVISION SUMMARY
  It is unnecessary to check if the change-set is null when looking at the
  KWayland code. Also the check would useless at the moment anyway because
  before that we access the change-set already in the DRM backend and we
  don't return if it would be null.

TEST PLAN
  Relevant auto tests pass.

REPOSITORY
  R108 KWin

BRANCH
  rmWlChangesCheck

REVISION DETAIL
  https://phabricator.kde.org/D23428

AFFECTED FILES
  abstract_wayland_output.cpp

To: romangg, #kwin
Cc: kwin, LeGast00n, The-Feren-OS-Dev, sbergeron, jraleigh, fbampaloukas, GB_2, mkulinski, ragreen, jackyalcine, Pitel, iodelay, crozbo, bwowk, ZrenBot, ngraham, alexeymin, himcesjf, lesliezhai, ali-mohamed, hardening, romangg, jensreuterberg, abetts, sebas, apol, mart
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