Power management fixes for 3.6-rc3

* Fixes for three obscure problems in the runtime PM core code found recently.
* Two fixes for the new "coupled" cpuidle code from Colin Cross and
  Jon Medhurst.
* intel_idle driver fix from Konrad Rzeszutek Wilk.
intel_idle: Check cpu_idle_get_driver() for NULL before dereferencing it.

If the machine is booted without any cpu_idle driver set
(b/c disable_cpuidle() has been called) we should follow
other users of cpu_idle API and check the return value
for NULL before using it.

Reported-and-tested-by: Mark van Dijk <mark@internecto.net>
Suggested-by: Jan Beulich <JBeulich@suse.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
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