kobject: convert kernel_kset to be a kobject

kernel_kset does not need to be a kset, but a much simpler kobject now
that we have kobj_attributes.

We also rename kernel_kset to kernel_kobj to catch all users of this
symbol with a build error instead of an easy-to-ignore build warning.

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

diff --git a/fs/dlm/lockspace.c b/fs/dlm/lockspace.c
index 0828beb..e64b0dc 100644
--- a/fs/dlm/lockspace.c
+++ b/fs/dlm/lockspace.c
@@ -223,7 +223,7 @@
 	INIT_LIST_HEAD(&lslist);
 	spin_lock_init(&lslist_lock);
 
-	dlm_kset = kset_create_and_add("dlm", NULL, &kernel_kset->kobj);
+	dlm_kset = kset_create_and_add("dlm", NULL, kernel_kobj);
 	if (!dlm_kset) {
 		printk(KERN_WARNING "%s: can not create kset\n", __FUNCTION__);
 		return -ENOMEM;