D8380: Modernize: use nullptr

[Aleix Pol Gonzalez]

apol accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R104 KScreen

BRANCH
  remove_unsed_variable

REVISION DETAIL
  https://phabricator.kde.org/D8380

To: mlaurent, afiestas, sebas, apol
Cc: plasma-devel, ZrenBot, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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