intel_idle: Fix dangling registration on error path.

intel_idle: Fix dangling registration on error path.

Orabug: 24810432

In the module_init() method, if the per-CPU allocation fails, then the
active cpuidle registration is not cleaned up.  This patch fixes the
issue by attempting the allocation before registration, and then
cleaning it up again on registration failure.

Signed-off-by: Richard Cochran <rcochran@linutronix.de>
Signed-off-by: Len Brown <len.brown@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
(cherry picked from commit e9df69ccd1322e87eee10f28036fad9e6c71f8dd)
Signed-off-by: Brian Maly <brian.maly@oracle.com>