[issue1359] PowerNow! support

[Alex Hornung (via DragonFly issue tracker)]

Alex Hornung <ahornung at gmail.com> added the comment:

I didn't explain myself well enough I guess: if you pass M_WAITOK to kmalloc you 
won't get NULL back EVER; there is no need to check for it, so you can safely 
remove the check after kmalloc.

For the rest at least that part looks fine to me. Thanks for your fixes. Hope 
someone can try this? I don't have an AMD CPU.

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