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1) Ensuring that both sd_scsi.c and sd_atapi.c report a device as
offline when its disksize cannot be determined.
2) Ensuring blksize is always non-zero, with a default value of 512.
3) Eliminating a couple of unneeded 'sectors' variables, which makes
the code easier for me to read if nothing else.
The bug was introduced when sd_atapi.c was changed to allow
'incomplete' implementations to be reported as online. REALLY
incomplete implementations (i.e. not even the disksize can be
determined) would be reported online with a blksize of zero.
Also fix a couple of knf nits in Mickey's last commit, and add another
check for an rpm of 0.
ok (pre-Mickey diffs) tdeval@ marc@ frantzen@
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