thermal: cpu_cooling: Clarify error message

Make it clear that it is a failure if the cpufreq driver was unable to
register as a cooling device. Makes it easier to find in logs and
grepping for words like fail, err, warn.

Signed-off-by: Amit Kucheria <amit.kucheria@linaro.org>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>

drivers/thermal/cpu_cooling.c

@@ -774,7 +774,7 @@ of_cpufreq_cooling_register(struct cpufreq_policy *policy)
 
 		cdev = __cpufreq_cooling_register(np, policy, capacitance);
 		if (IS_ERR(cdev)) {
-			pr_err("cpu_cooling: cpu%d is not running as cooling device: %ld\n",
+			pr_err("cpu_cooling: cpu%d failed to register as cooling device: %ld\n",
 			       policy->cpu, PTR_ERR(cdev));
 			cdev = NULL;
 		}