kobject: convert /sys/firmware/acpi/ to use kobject_create

We don't need a kset here, a simple kobject will do just fine, so
dynamically create the kobject and use it.

Cc: Kay Sievers <kay.sievers@vrfy.org>
Cc: Len Brown <lenb@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
index 7c172d9..e550da6 100644
--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -743,7 +743,7 @@
 	return -ENODEV;
 }
 
-decl_subsys(acpi, NULL);
+struct kobject *acpi_kobj;
 
 static int __init acpi_init(void)
 {
@@ -755,10 +755,11 @@
 		return -ENODEV;
 	}
 
-	result = firmware_register(&acpi_subsys);
-	if (result < 0)
-		printk(KERN_WARNING "%s: firmware_register error: %d\n",
-			__FUNCTION__, result);
+	acpi_kobj = kobject_create_and_add("acpi", &firmware_kset->kobj);
+	if (!acpi_kobj) {
+		printk(KERN_WARNING "%s: kset create error\n", __FUNCTION__);
+		acpi_kobj = NULL;
+	}
 
 	result = acpi_bus_init();