D20644: Fix memory leak when reading some tar files

[Albert Astals Cid]

aacid created this revision.
Herald added a project: Frameworks.
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REVISION SUMMARY
  Not sure if they are even malformed (don't know enough about the tar format), but oss-fuzz has produced a file where there's files and then there's the special . file (the root).
  
  Since the files prior to finding "." need to be child of something, we already created a rootdir, so when we find "." we need to delete the existing one.

REPOSITORY
  R243 KArchive

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D20644

AFFECTED FILES
  src/karchive.cpp

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