cpufreq: brcmstb-avs: 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 to commit log ]
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>

Author: Zihuan Zhang

drivers/cpufreq/brcmstb-avs-cpufreq.c

@@ -480,16 +480,14 @@ static bool brcm_avs_is_firmware_loaded(struct private_data *priv)
 
 static unsigned int brcm_avs_cpufreq_get(unsigned int cpu)
 {
-	struct cpufreq_policy *policy = cpufreq_cpu_get(cpu);
+	struct cpufreq_policy *policy __free(put_cpufreq_policy) = cpufreq_cpu_get(cpu);
 	struct private_data *priv;
 
 	if (!policy)
 		return 0;
 
 	priv = policy->driver_data;
 
-	cpufreq_cpu_put(policy);
-
 	return brcm_avs_get_frequency(priv->base);
 }