D17478: use nullptr instead of NULL

[Harald Sitter]

sitter created this revision.
Herald added a project: KDE Edu.
Herald added a subscriber: kde-edu.
sitter requested review of this revision.

REVISION SUMMARY
  more modern and silences gcc Wzero-as-null-pointer-constant

TEST PLAN
  builds

REPOSITORY
  R328 KBruch

BRANCH
  master

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

AFFECTED FILES
  src/KBruch.cpp
  src/Task.cpp

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