PM / Domains: Fix memory leak on error path in pm_genpd_attach_cpuidle

If pm_genpd_attach_cpudidle failed we leak memory stored in 'cpu_data'.
Signed-off-by: NJonghwan Choi <jhbird.choi@samsung.com>
Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/base/power/domain.c

@@ -1862,7 +1862,7 @@ int pm_genpd_attach_cpuidle(struct generic_pm_domain *genpd, int state)
 	cpuidle_drv = cpuidle_driver_ref();
 	if (!cpuidle_drv) {
 		ret = -ENODEV;
-		goto out;
+		goto err_drv;
 	}
 	if (cpuidle_drv->state_count <= state) {
 		ret = -EINVAL;
@@ -1884,6 +1884,9 @@ int pm_genpd_attach_cpuidle(struct generic_pm_domain *genpd, int state)
 
  err:
 	cpuidle_driver_unref();
+
+ err_drv:
+	kfree(cpu_data);
 	goto out;
 }