netconsole: Use kstrtobool() instead of kstrtoint()

Replace kstrtoint() by kstrtobool() in the sysfs _store() functions.
This improves the user usability and simplify the code.

With this fix, it is now possible to use [YyNn] to set and unset a
feature. Old behaviour is still unchanged.

kstrtobool() is also safer and doesn't need the extra validation that
is required when converting a string to bool (end field in the struct),
which makes the code simpler.

Suggested-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Breno Leitao <leitao@debian.org>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Link: https://lore.kernel.org/r/20230721092146.4036622-2-leitao@debian.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/netconsole.c

@@ -333,17 +333,15 @@ static ssize_t enabled_store(struct config_item *item,
 {
 	struct netconsole_target *nt = to_target(item);
 	unsigned long flags;
-	int enabled;
+	bool enabled;
 	int err;
 
 	mutex_lock(&dynamic_netconsole_mutex);
-	err = kstrtoint(buf, 10, &enabled);
-	if (err < 0)
+	err = kstrtobool(buf, &enabled);
+	if (err)
 		goto out_unlock;
 
 	err = -EINVAL;
-	if (enabled < 0 || enabled > 1)
-		goto out_unlock;
 	if ((bool)enabled == nt->enabled) {
 		pr_info("network logging has already %s\n",
 			nt->enabled ? "started" : "stopped");
@@ -394,7 +392,7 @@ static ssize_t release_store(struct config_item *item, const char *buf,
 			     size_t count)
 {
 	struct netconsole_target *nt = to_target(item);
-	int release;
+	bool release;
 	int err;
 
 	mutex_lock(&dynamic_netconsole_mutex);
@@ -405,13 +403,9 @@ static ssize_t release_store(struct config_item *item, const char *buf,
 		goto out_unlock;
 	}
 
-	err = kstrtoint(buf, 10, &release);
-	if (err < 0)
-		goto out_unlock;
-	if (release < 0 || release > 1) {
-		err = -EINVAL;
+	err = kstrtobool(buf, &release);
+	if (err)
 		goto out_unlock;
-	}
 
 	nt->release = release;
 
@@ -426,7 +420,7 @@ static ssize_t extended_store(struct config_item *item, const char *buf,
 		size_t count)
 {
 	struct netconsole_target *nt = to_target(item);
-	int extended;
+	bool extended;
 	int err;
 
 	mutex_lock(&dynamic_netconsole_mutex);
@@ -437,13 +431,9 @@ static ssize_t extended_store(struct config_item *item, const char *buf,
 		goto out_unlock;
 	}
 
-	err = kstrtoint(buf, 10, &extended);
-	if (err < 0)
-		goto out_unlock;
-	if (extended < 0 || extended > 1) {
-		err = -EINVAL;
+	err = kstrtobool(buf, &extended);
+	if (err)
 		goto out_unlock;
-	}
 
 	nt->extended = extended;