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This fixes bug 491552. The patch is short but in its effect not trivial
-- but got some testing both from folks in the upstream fdo bugzilla and from
the Ubuntuans. Seems to work properly. If this is not tagged then
devicekit-disks will wakeup many disks every 30mins for no reason. Also
includes a small parsing fix for the SMART data of some early Apple SSDs and
makes sure that libatasmart doesn't accidently assume the type of SSD has a lot
of bad sectors.