test, provide regression to see if hxdiff really returns 1 on differing input

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
Merge branch 'bug/hxdiff-neg'

* bug/hxdiff-neg:
  test, provide regression to see if hxdiff really returns 1 on differing input
minor, use a timeout'ing poll() for hxdiff fanout

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
fix, PEBKAC, use actual file sizes of file1 and file2

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
Merge branch 'bug/stalling-pipes'

* bug/stalling-pipes:
  fix, PEBKAC, use actual file sizes of file1 and file2
  minor, use a timeout'ing poll() for hxdiff fanout