r266165: powerd hang sytem on MacbookPro 2013

[Huang Wen Hui]

Hi,
Before r266165, There is no "dev.cpu.0.freq"  on my  MacbookPro 2013, now I
got:

#sysctl dev.cpu.0.freq
dev.cpu.0.freq: 2601

but If start powerd, system will quickly hang, both keyboard and ethernet
are not respond.

Cheers,

Huang Wenhui