Bug#510859: zaptel: rmmod of zaphfc gives kernel stack trace

[Tristan Hill]

Based on the code reference in the warning (referring to
http://lxr.linux.no/linux+v2.6.26/arch/x86/kernel/smp.c#L207) I believe
its due to using the interrupt disabling spinlock functions.

I have not have the system deadlock as indicated by comments in the code
near the above link and the code seems to have changed/moved a lot in
newer kernels so don't know how much a problem it is.

The warning/stack trace goes away with the attached patch.  I assume its
safe to not disable interrupts once the handler has been unregistered.

Thanks
Tristan
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