watchdog: always print when registering watchdog fails

So far, only 'watchdog_register_device' prints an error if registering
the watchdog driver fails. '__watchdog_register_device' doesn't.
Refactor the code so that both print out. Drivers can then rely on that
and skip their own error messages.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20241004200314.5459-2-wsa+renesas@sang-engineering.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>

Author: Wolfram Sang

drivers/watchdog/watchdog_core.c

@@ -237,7 +237,7 @@ void watchdog_set_restart_priority(struct watchdog_device *wdd, int priority)
 }
 EXPORT_SYMBOL_GPL(watchdog_set_restart_priority);
 
-static int __watchdog_register_device(struct watchdog_device *wdd)
+static int ___watchdog_register_device(struct watchdog_device *wdd)
 {
 	int ret, id = -1;
 
@@ -337,6 +337,22 @@ static int __watchdog_register_device(struct watchdog_device *wdd)
 	return 0;
 }
 
+static int __watchdog_register_device(struct watchdog_device *wdd)
+{
+	const char *dev_str;
+	int ret;
+
+	ret = ___watchdog_register_device(wdd);
+	if (ret) {
+		dev_str = wdd->parent ? dev_name(wdd->parent) :
+			  (const char *)wdd->info->identity;
+		pr_err("%s: failed to register watchdog device (err = %d)\n",
+			dev_str, ret);
+	}
+
+	return ret;
+}
+
 /**
  * watchdog_register_device() - register a watchdog device
  * @wdd: watchdog device
@@ -350,7 +366,6 @@ static int __watchdog_register_device(struct watchdog_device *wdd)
 
 int watchdog_register_device(struct watchdog_device *wdd)
 {
-	const char *dev_str;
 	int ret = 0;
 
 	mutex_lock(&wtd_deferred_reg_mutex);
@@ -360,13 +375,6 @@ int watchdog_register_device(struct watchdog_device *wdd)
 		watchdog_deferred_registration_add(wdd);
 	mutex_unlock(&wtd_deferred_reg_mutex);
 
-	if (ret) {
-		dev_str = wdd->parent ? dev_name(wdd->parent) :
-			  (const char *)wdd->info->identity;
-		pr_err("%s: failed to register watchdog device (err = %d)\n",
-			dev_str, ret);
-	}
-
 	return ret;
 }
 EXPORT_SYMBOL_GPL(watchdog_register_device);