PM / OPP: passing NULL to PTR_ERR()

The code was using PTR_ERR(NULL) which causes a static checker warning.
I have fixed up the printks and changed the return to -ENOENT.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/base/power/opp/cpu.c

@@ -223,8 +223,7 @@ int dev_pm_opp_of_get_sharing_cpus(struct device *cpu_dev, cpumask_var_t cpumask
 	/* Get OPP descriptor node */
 	np = _of_get_opp_desc_node(cpu_dev);
 	if (!np) {
-		dev_dbg(cpu_dev, "%s: Couldn't find opp node: %ld\n", __func__,
-			PTR_ERR(np));
+		dev_dbg(cpu_dev, "%s: Couldn't find cpu_dev node.\n", __func__);
 		return -ENOENT;
 	}
 
@@ -247,9 +246,9 @@ int dev_pm_opp_of_get_sharing_cpus(struct device *cpu_dev, cpumask_var_t cpumask
 		/* Get OPP descriptor node */
 		tmp_np = _of_get_opp_desc_node(tcpu_dev);
 		if (!tmp_np) {
-			dev_err(tcpu_dev, "%s: Couldn't find opp node: %ld\n",
-				__func__, PTR_ERR(tmp_np));
-			ret = PTR_ERR(tmp_np);
+			dev_err(tcpu_dev, "%s: Couldn't find tcpu_dev node.\n",
+				__func__);
+			ret = -ENOENT;
 			goto put_cpu_node;
 		}