Power management fixes for v4.10-rc1

 - Prevent the acpi-cpufreq driver from crashing on exit by fixing
   a check against the __cpuhp_setup_state() return value and fix
   the kerneldoc description of that function to make it clear that
   it may return positive numbers on success too (Boris Ostrovsky).

 - Drop an incorrect __init annotation of a function in the
   s3c64xx cpufreq driver and fix a build warning generated (by
   older compilers) because of it (Arnd Bergmann).
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