cpufreq: Drop unnecessary check from cpufreq_policy_alloc()

Since cpufreq_policy_alloc() doesn't use its dev variable for
anything useful, drop that variable from there along with the
NULL check against it.
Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: NViresh Kumar <viresh.kumar@linaro.org>

drivers/cpufreq/cpufreq.c

@@ -1073,13 +1073,9 @@ static void handle_update(struct work_struct *work)
 
 static struct cpufreq_policy *cpufreq_policy_alloc(unsigned int cpu)
 {
-	struct device *dev = get_cpu_device(cpu);
 	struct cpufreq_policy *policy;
 	int ret;
 
-	if (WARN_ON(!dev))
-		return NULL;
-
 	policy = kzalloc(sizeof(*policy), GFP_KERNEL);
 	if (!policy)
 		return NULL;