patch to catch non-working hpet

[Rui Paulo]

Nate Lawson wrote:
> I need someone to test this code.  You have to have an HPET timer.  It
> should detect the case where it's non-working on at least one Acer
> system but not break others.  Your system should boot and work normally
> with no change in dmesg.  Let me know if it breaks something, thx.

Works fine.
acpi_hpet0: <High Precision Event Timer> iomem 0xfed00000-0xfed003ff on
acpi0
Timecounter "HPET" frequency 14318180 Hz quality 2000

No changes in dmesg.

Regards.
-- 
Rui Paulo