D20702: KTar: Protect against negative longlink sizes

[Albert Astals Cid]

aacid created this revision.
Herald added a project: Frameworks.
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aacid requested review of this revision.

REVISION SUMMARY
  Some of the negative values can cause uninitialize memory reads further down the code
  
  oss-fuzz #14381

REPOSITORY
  R243 KArchive

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D20702

AFFECTED FILES
  src/ktar.cpp

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