platform/x86/dell: alienware-wmi: Use kasprintf()

Use kasprintf() instead of hand writing it.
This saves the need of an intermediate buffer.
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Link: https://lore.kernel.org/r/f2b2c9e5d80550e480a627c1b2139d5cc9472ffa.1699775015.git.christophe.jaillet@wanadoo.frReviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

drivers/platform/x86/dell/alienware-wmi.c

@@ -429,7 +429,6 @@ static DEVICE_ATTR(lighting_control_state, 0644, show_control_state,
 static int alienware_zone_init(struct platform_device *dev)
 {
 	u8 zone;
-	char buffer[10];
 	char *name;
 
 	if (interface == WMAX) {
@@ -466,8 +465,7 @@ static int alienware_zone_init(struct platform_device *dev)
 		return -ENOMEM;
 
 	for (zone = 0; zone < quirks->num_zones; zone++) {
-		sprintf(buffer, "zone%02hhX", zone);
-		name = kstrdup(buffer, GFP_KERNEL);
+		name = kasprintf(GFP_KERNEL, "zone%02hhX", zone);
 		if (name == NULL)
 			return 1;
 		sysfs_attr_init(&zone_dev_attrs[zone].attr);