cpufreq: mediatek: Use scope-based cleanup helper

Replace the manual cpufreq_cpu_put() with __free(put_cpufreq_policy)
annotation for policy references. This reduces the risk of reference
counting mistakes and aligns the code with the latest kernel style.

No functional change intended.

Signed-off-by: Zihuan Zhang <zhangzihuan@kylinos.cn>
[ Viresh: Minor changes ]
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>

Author: Zihuan Zhang

drivers/cpufreq/mediatek-cpufreq.c

@@ -320,7 +320,6 @@ static int mtk_cpufreq_opp_notifier(struct notifier_block *nb,
 	struct dev_pm_opp *new_opp;
 	struct mtk_cpu_dvfs_info *info;
 	unsigned long freq, volt;
-	struct cpufreq_policy *policy;
 	int ret = 0;
 
 	info = container_of(nb, struct mtk_cpu_dvfs_info, opp_nb);
@@ -353,12 +352,12 @@ static int mtk_cpufreq_opp_notifier(struct notifier_block *nb,
 			}
 
 			dev_pm_opp_put(new_opp);
-			policy = cpufreq_cpu_get(info->opp_cpu);
-			if (policy) {
+
+			struct cpufreq_policy *policy __free(put_cpufreq_policy)
+				= cpufreq_cpu_get(info->opp_cpu);
+			if (policy)
 				cpufreq_driver_target(policy, freq / 1000,
 						      CPUFREQ_RELATION_L);
-				cpufreq_cpu_put(policy);
-			}
 		}
 	}