D17478: use nullptr instead of NULL

[Albert Astals Cid]

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

REPOSITORY
  R328 KBruch

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D17478

To: sitter, aacid
Cc: kde-edu, narvaez, apol
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