[Bug-tar] Another tarbomb RFC

[Connor Behan]

Hello. Since the GNU tar 1.27 release, I have updated my patch for
limiting the top-level names extracted to one:
http://lists.gnu.org/archive/html/bug-tar/2013-10/msg00003.html

Do you think there are any remaining problems with it? I have read it
over again a few times and the only not-so-pleasing thing I have noticed
is that first_top_level is never free'd. However, I think this is okay
because it needs to be stored until the last file is extracted and
execution ends after that anyway.

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