thermal: cpu_cooling: no need to set cpufreq_dev to NULL

It will be overwritten soon with return value of kzalloc().
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>

drivers/thermal/cpu_cooling.c

@@ -451,7 +451,7 @@ __cpufreq_cooling_register(struct device_node *np,
 			   const struct cpumask *clip_cpus)
 {
 	struct thermal_cooling_device *cool_dev;
-	struct cpufreq_cooling_device *cpufreq_dev = NULL;
+	struct cpufreq_cooling_device *cpufreq_dev;
 	unsigned int min = 0, max = 0;
 	char dev_name[THERMAL_NAME_LENGTH];
 	int ret = 0, i;