Merge branch 'pm-cpuidle-next' into linux-next

* pm-cpuidle-next:
  cpuidle: Check if device is already registered
  cpuidle: Introduce __cpuidle_device_init()
  cpuidle: Introduce __cpuidle_unregister_device()
  cpuidle: Add missing forward declarations of structures
  cpuidle: Make cpuidle's sysfs directory dynamically allocated
  cpuidle: Fix white space to follow CodingStyle
  cpuidle: Check cpuidle_enable_device() return value
  cpuidle: Make it clear that governors cannot be modules