Bug#593652: grub-common: grub-probe segfault (revised patch)

[Martin Schitter]

here is a revised patch.

it takes care, that spare (index == 0xffff) or faulty (index == 0xfffe) 
drives don't increment array->nr_devs. otherwise the function 
grub_is_array_readable would return wrong results.

sorry, i didn't recognize that in my first attempt.
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