[NTOSKRNL]

[NTOSKRNL]
Fix string size to store GPT GUIDs.
This was causing a buffer overflow (with ending null char) and thus a stack corruption.
The side effect of the stack corruption was that the debug code (display) was looping
forever while attempting to read partition table making ntoskrnl unable to boot with
a machine where there's a GPT disk.
Kernel is now able again to handle GPT disks (and they can be used again in user-land).

This was magically hidding before r59923 or by disabling NDEBUG. Lovely Heisenbugs :-).

svn path=/trunk/; revision=60003