ACPI: use kstrdup()

 Use kstrdup rather than duplicating its implementation

 The semantic patch that makes this output is available
 in scripts/coccinelle/api/kstrdup.cocci.

 More information about semantic patching is available at
 http://coccinelle.lip6.fr/Signed-off-by: Thomas Meyer <thomas@m3y3r.de>
Signed-off-by: Len Brown <len.brown@intel.com>

drivers/acpi/scan.c

@@ -1062,13 +1062,12 @@ static void acpi_add_id(struct acpi_device *device, const char *dev_id)
 	if (!id)
 		return;
 
-	id->id = kmalloc(strlen(dev_id) + 1, GFP_KERNEL);
+	id->id = kstrdup(dev_id, GFP_KERNEL);
 	if (!id->id) {
 		kfree(id);
 		return;
 	}
 
-	strcpy(id->id, dev_id);
 	list_add_tail(&id->list, &device->pnp.ids);
 }