ARM: OMAP3: cpuidle - check the powerdomain lookup

At init time, check the powerdomains lookup is successful otherwise
exit the cpuidle driver init function with -ENODEV like what is done for the
omap3 cpuidle driver.

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Reviewed-by: Jean Pihet <j-pihet@ti.com>
Tested-by: Kevin Hilman <khilman@ti.com>
Signed-off-by: Kevin Hilman <khilman@ti.com>

arch/arm/mach-omap2/cpuidle34xx.c

@@ -363,6 +363,9 @@ int __init omap3_idle_init(void)
 	per_pd = pwrdm_lookup("per_pwrdm");
 	cam_pd = pwrdm_lookup("cam_pwrdm");
 
+	if (!mpu_pd || !core_pd || !per_pd || !cam_pd)
+		return -ENODEV;
+
 	cpuidle_register_driver(&omap3_idle_driver);
 
 	dev = &per_cpu(omap3_idle_dev, smp_processor_id());