D20605: Fix null-dereference on malformed tar files

[Albert Astals Cid]

aacid created this revision.
Herald added a project: Frameworks.
Herald added a subscriber: kde-frameworks-devel.
aacid requested review of this revision.

REVISION SUMMARY
  findOrCreate can return nullptr so fail if it does
  
  oss-fuzz #14275

REPOSITORY
  R243 KArchive

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D20605

AFFECTED FILES
  src/ktar.cpp

To: aacid
Cc: kde-frameworks-devel, michaelh, ngraham, bruns
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