[PATCH] fix HDIO_GETGEO ioctl for linux

[Andres Salomon]

Hi,

I ran into a problem when running parted on Ubuntu Breezy with an sx8
device; it would SIGFPE upon startup.  The culprit, it turns out, is the
HDIO_GETGEO ioctl; when asking for geometry information about a
partition (the name-based probing wasn't working well for devices
like /dev/sx8/0p1, etc), sectors and/or heads was 0.  This patch makes
parted to not only check if the ioctl didn't fail, but also make sure it
returned sane results (both are unsigned, so we don't have to worry
about <0).

patch1.patch
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