Reported to me off-list by Laurent Vivier, who found the
problem while working on https://bugzilla.redhat.com/1433193
Broken since 2.7, but the fix is a one-liner (pointing out my
embarrassing mistake of mis-converting a pre-decrement operator);
as a bug fix, it still qualifies for 2.9 in spite of hard freeze,
on the other hand, as the regression was not introduced in 2.9,
I also understand if it is postponed.

Eric Blake (2):
  tests: Expose regression in QemuOpts visitor
  qapi: Fix QemuOpts visitor regression on unvisited input

 qapi/opts-visitor.c       |  6 +++---
 tests/test-opts-visitor.c | 29 ++++++++++++++++++++++++++---
 2 files changed, 29 insertions(+), 6 deletions(-)

-- 
2.9.3