In the WAIT_ALL case in spin_wait_for_sync_file(), we were returning the
moment we saw the first success. However, this isn't a wait-all, it's a
bad wait-any. We should instead just continue on to check the next sync
until we've ensured that every sync in the array has a sync file. The
only reason this wasn't blowing up in our face is because it only
affects non-timeline drivers (pretty rare these days) and because most
of the places where we use WAIT_PENDING on non-timeline drivers is to
guard a sync file export and those typically have only a single sync in
the array.
Cc: mesa-stable
Reviewed-by: Gurchetan Singh <gurchetansingh@google.com>
Reviewed-by: Emma Anholt <emma@anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/38635>
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