backup: Switch backup_do_cow() to byte-based
We are gradually converting to byte-based interfaces, as they are easier to reason about than sector-based. Convert another internal function (no semantic change). Signed-off-by:Eric Blake <eblake@redhat.com> Reviewed-by:
John Snow <jsnow@redhat.com> Reviewed-by:
Jeff Cody <jcody@redhat.com> Reviewed-by:
Kevin Wolf <kwolf@redhat.com> Signed-off-by:
Kevin Wolf <kwolf@redhat.com>
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