cpufreq: Clear policy->cpus even for the last CPU

We clear policy->cpus mask while CPUs are hotplugged out. We do it for all CPUs
except the last CPU of the policy. I don't remember what the rationale behind
that was, but I couldn't think of anything that will break if we remove this
conditional clearing and always clear policy->cpus.

The benefit we get out of it is, we can know if a policy is active or not by
checking if this field is empty or not. That will be used by later commits.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Acked-by: Saravana Kannan <skannan@codeaurora.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/cpufreq/cpufreq.c

@@ -1430,9 +1430,7 @@ static int __cpufreq_remove_dev_finish(struct device *dev,
 
 	down_write(&policy->rwsem);
 	cpus = cpumask_weight(policy->cpus);
-
-	if (cpus > 1)
-		cpumask_clear_cpu(cpu, policy->cpus);
+	cpumask_clear_cpu(cpu, policy->cpus);
 	up_write(&policy->rwsem);
 
 	/* If cpu is last user of policy, free policy */