[Libguestfs] nbdkit test-checkwrite.sh failing occasionally on ppc64le

[Richard W.M. Jones]

Arrrgh!

  https://koji.fedoraproject.org/koji/taskinfo?taskID=89618509
  FAIL: test-checkwrite.sh

Last week I reserved a ppc64le machine which had almost exactly the
same spec as one of the Koji builders and ran both the full test suite
and this single test thousands of times over a few days and it didn't
fail even once.  Ideas gratefully accepted :-/

Rich.

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