PM / Domains: remove unnecessary unlikely()

WARN_ON() already contains an unlikely(), so it's not necessary to use
unlikely.
Signed-off-by: Yangtao Li <tiny.windzz@gmail.com>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/base/power/domain.c

@@ -391,11 +391,9 @@ int dev_pm_genpd_set_performance_state(struct device *dev, unsigned int state)
 	if (unlikely(!genpd->set_performance_state))
 		return -EINVAL;
 
-	if (unlikely(!dev->power.subsys_data ||
-		     !dev->power.subsys_data->domain_data)) {
-		WARN_ON(1);
+	if (WARN_ON(!dev->power.subsys_data ||
+		     !dev->power.subsys_data->domain_data))
 		return -EINVAL;
-	}
 
 	genpd_lock(genpd);