cpufreq: return early from __cpufreq_driver_getavg()

There is no need to do cpufreq_get_cpu() and cpufreq_put_cpu() for drivers that
don't support getavg() routine.
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/cpufreq/cpufreq.c

@@ -1511,11 +1511,13 @@ int __cpufreq_driver_getavg(struct cpufreq_policy *policy, unsigned int cpu)
 {
 	int ret = 0;
 
+	if (!(cpu_online(cpu) && cpufreq_driver->getavg))
+		return 0;
+
 	policy = cpufreq_cpu_get(policy->cpu);
 	if (!policy)
 		return -EINVAL;
 
-	if (cpu_online(cpu) && cpufreq_driver->getavg)
 	ret = cpufreq_driver->getavg(policy, cpu);
 
 	cpufreq_cpu_put(policy);