atapi: cleanup/fix mode sense results
The first two bytes (after the 8-byte ATAPI header) are the mode page number and the number of bytes after the length field itself. Make this clear in the code. The AUDIO_CTL page was filled with wrong values. It is not anymore in MMC, but at least keep the values sane. Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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