mirror: Switch mirror_do_read() 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, preserving all existing semantics, and adding one more assertion that things are still sector-aligned (so that conversions to sectors in mirror_read_complete don't need to round). Signed-off-by: NEric Blake <eblake@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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