cpufreq: Clarify the comment in cpufreq_set_policy()

One of the responsibility of the ->verify() callback is to make sure
that the policy's min frequency is <= max frequency as this isn't
guaranteed by the QoS framework which gave us those values.

Update the comment in cpufreq_set_policy() to clarify that.
Suggested-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
[ rjw: Minor changes of the new comment ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/cpufreq/cpufreq.c

@@ -2385,7 +2385,10 @@ int cpufreq_set_policy(struct cpufreq_policy *policy,
 	new_policy->min = freq_qos_read_value(&policy->constraints, FREQ_QOS_MIN);
 	new_policy->max = freq_qos_read_value(&policy->constraints, FREQ_QOS_MAX);
 
-	/* verify the cpu speed can be set within this limit */
+	/*
+	 * Verify that the CPU speed can be set within these limits and make sure
+	 * that min <= max.
+	 */
 	ret = cpufreq_driver->verify(new_policy);
 	if (ret)
 		return ret;