Pull in 1.1.5.1 changes to sd.c from 1.23 to 1.27 (basically the fixes for drives that return sector counts of 0 and cause division by 0 traps during the probe). Reviewed by:	Dave <root@hclb.demon.co.uk> Obtained from:	FreeBSD 1.1.5.1
Pull in 1.1.5.1 changes to sd.c from 1.23 to 1.27 (basically the fixes for
drives that return sector counts of 0 and cause division by 0 traps during
the probe).
Reviewed by:	Dave <root@hclb.demon.co.uk>
Obtained from:	FreeBSD 1.1.5.1

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