PM / OPP: fix debug/error messages in dev_pm_opp_of_get_sharing_cpus()

These log messages are wrong because _of_get_opp_desc_node() returns
an operating-points-v2 node.

Commit a6eed752 ("PM / OPP: passing NULL to PTR_ERR()") fixed
static checker warnings, and reworded the messages at the same time
(but the latter was not mentioned in the git-log).

Restore the correct messages.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/base/power/opp/of.c

@@ -562,7 +562,7 @@ int dev_pm_opp_of_get_sharing_cpus(struct device *cpu_dev,
 	/* Get OPP descriptor node */
 	np = _of_get_opp_desc_node(cpu_dev);
 	if (!np) {
-		dev_dbg(cpu_dev, "%s: Couldn't find cpu_dev node.\n", __func__);
+		dev_dbg(cpu_dev, "%s: Couldn't find opp node.\n", __func__);
 		return -ENOENT;
 	}
 
@@ -587,7 +587,7 @@ int dev_pm_opp_of_get_sharing_cpus(struct device *cpu_dev,
 		/* Get OPP descriptor node */
 		tmp_np = _of_get_opp_desc_node(tcpu_dev);
 		if (!tmp_np) {
-			dev_err(tcpu_dev, "%s: Couldn't find tcpu_dev node.\n",
+			dev_err(tcpu_dev, "%s: Couldn't find opp node.\n",
 				__func__);
 			ret = -ENOENT;
 			goto put_cpu_node;