Bug#593652: grub-common: grub-probe segfault

[Martin Schitter]

just a few additional remarks about this bug fix in my last post:

spare disks within a raid array don't show a useful 'index' number.
they may have values like 65535 in their index field.

whiteout this fix it's nearly impossible to install grub on any machine 
with software raid and spare disks under debian squezze or unstable. 
every call of grub-probe will segfault. this belongs to "grub-pc" and 
"grub-legacy". both of them share the package grub-common and this grave 
bug. :(