D23618: Use nullptr everywhere

[Vlad Zahorodnii]

zzag added inline comments.

INLINE COMMENTS

> romangg wrote in client.cpp:1771
> There were some more of that below but if you didn't see them before pushing not a big issue.

I re-ran clang-tidy so it's not a big deal.

REPOSITORY
  R108 KWin

REVISION DETAIL
  https://phabricator.kde.org/D23618

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