D20643: Fix invalid memory write on malformed tar files

[Albert Astals Cid]

aacid created this revision.
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REVISION SUMMARY
  If the file says it has a longlink of more than int_max bytes, the resize would do nothing (since casting to int means a negative number) and we'd try writing on a bytearray of size 0

REPOSITORY
  R243 KArchive

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D20643

AFFECTED FILES
  src/ktar.cpp

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