D10168: Use nullptr for passing a null pointer to crc32

[Albert Astals Cid]

aacid created this revision.
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REVISION SUMMARY
  I'm a bit unconvinced, wihtout it we get a warning if we enable -Wzero-as-null-pointer-constant
  but using Z_NULL seems to be more "what the library wants"
  
  If we don't want this, this would be a reason against enabling -Wzero-as-null-pointer-constant
  for all the frameworks as i've suggested in the other review

REPOSITORY
  R243 KArchive

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D10168

AFFECTED FILES
  src/kgzipfilter.cpp
  src/kzip.cpp

To: aacid
Cc: #frameworks, michaelh
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