qcow: Use bdrv_(p)write_sync for metadata writes
Use bdrv_(p)write_sync to ensure metadata integrity in case of a crash. Signed-off-by: NKevin Wolf <kwolf@redhat.com> (cherry picked from commit 5e5557d9) Conflicts: block/qcow.c Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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