If an I/O APIC returns 0xffffffff for its version register after we map it, assume it is bogus and return NULL instead of trying to parse it as an APIC.
If an I/O APIC returns 0xffffffff for its version register after we map it,
assume it is bogus and return NULL instead of trying to parse it as an
APIC.

Inspired by:	linux bug reports via njl

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