mendersoftware / mender / 1575559860

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fix: Allow blocks of zeroes after ArchiveEOF

The tar format says [1]:
> The end of an archive is marked by at least two consecutive zero-filled records.

Which means that if a file a is valid tar archive, a copy of the
file with blocks of zeroes appended to its end is still a valid
archive, with the same content.

Thus we cannot consider extra zeroes in a file for which
libarchive tells us `ARCHIVE_EOF` as superflous data.

[1] https://en.wikipedia.org/wiki/Tar_(computing)#File_format

Ticket: MEN-7810
Changelog: none
Signed-off-by: Vratislav Podzimek <vratislav.podzimek@northern.tech>

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