thermal: cpu_cooling: Replace dev_warn with dev_err

There isn't much the user can do on seeing these warnings, as the
hardware is actually okay. dev_err suits much better here.
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>

drivers/thermal/cpu_cooling.c

@@ -397,7 +397,7 @@ static int get_static_power(struct cpufreq_cooling_device *cpufreq_device,
 	dev_pm_opp_put(opp);
 
 	if (voltage == 0) {
-		dev_warn_ratelimited(cpufreq_device->cpu_dev,
+		dev_err_ratelimited(cpufreq_device->cpu_dev,
 				    "Failed to get voltage for frequency %lu: %ld\n",
 				    freq_hz, IS_ERR(opp) ? PTR_ERR(opp) : 0);
 		return -EINVAL;
@@ -691,7 +691,7 @@ static int cpufreq_power2state(struct thermal_cooling_device *cdev,
 
 	*state = cpufreq_cooling_get_level(cpu, target_freq);
 	if (*state == THERMAL_CSTATE_INVALID) {
-		dev_warn_ratelimited(&cdev->device,
+		dev_err_ratelimited(&cdev->device,
 				    "Failed to convert %dKHz for cpu %d into a cdev state\n",
 				    target_freq, cpu);
 		return -EINVAL;