backup: Switch BackupBlockJob to byte-based
We are gradually converting to byte-based interfaces, as they are easier to reason about than sector-based. Continue by converting an internal structure (no semantic change), and all references to tracking progress. Drop a redundant local variable bytes_per_cluster. Signed-off-by: NEric Blake <eblake@redhat.com> Reviewed-by: NJohn Snow <jsnow@redhat.com> Reviewed-by: NJeff Cody <jcody@redhat.com> Reviewed-by: NKevin Wolf <kwolf@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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