[Bug 196694] libmd doesn't detect EOF properly; can get stuck in an infinite loop in MDXFileChunk

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=196694

--- Comment #2 from commit-hook at freebsd.org ---
A commit references this bug:

Author: ngie
Date: Fri Apr 24 11:03:48 UTC 2015
New revision: 281928
URL: https://svnweb.freebsd.org/changeset/base/281928

Log:
  Avoid an infinite loop by ensuring that the amount of bytes read is greater
  than 0 in MDXFileChunk when calculating the checksum

  This edgecase can be triggered if the file is truncated while the checksum
  is being calculated (i.e. the EOF is reached)

  Differential Revision: https://reviews.freebsd.org/D2351 (patch by darius)
  PR: 196694
  Reviewed by: delphij, ngie
  Submitted by: Daniel O'Connor <darius at dons.net.au>
  Sponsored by: EMC / Isilon Storage Division

Changes:
  head/lib/libmd/mdXhl.c

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