qapi: Pass '-u' when doing non-silent diff
Ed-script diffs are awful compared to context diffs. Fix another 'diff -q' while in the area (if the files are different, being noisy makes it easier to diagnose why). While at it, diff .err before .out, because if a test fails, .err is more likely to contain the most important information for fixing the failure. Fixes: 46ec4fceSigned-off-by: NEric Blake <eblake@redhat.com> Reviewed-by: NPhilippe Mathieu-Daudé <f4bug@amsat.org> Message-Id: <20180315125116.804342-1-eblake@redhat.com>
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