Power management and ACPI fixes for v4.3-rc5

 - Two fixes for cpufreq regressions, an acpi-cpufreq driver one
   introduced during the 4.2 cycle when we started to preserve
   cpufreq directories for offline CPUs and a general one
   introduced recently (Srinivas Pandruvada).

 - Two devfreq fixes, one for a double kfree() in an error code
   path and one for a confusing sysfs-related failure (Geliang Tang,
   Tobias Jakobi).

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