driver core: remove subsystem_init()

There is only one user of it, and it is only a wrapper for kset_init().

Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/base/class.c b/drivers/base/class.c
index 3e9b04c..5b9cf06 100644
--- a/drivers/base/class.c
+++ b/drivers/base/class.c
@@ -861,7 +861,7 @@
 
 	/* ick, this is ugly, the things we go through to keep from showing up
 	 * in sysfs... */
-	subsystem_init(&class_obj_subsys);
+	kset_init(&class_obj_subsys);
 	if (!class_obj_subsys.kobj.parent)
 		class_obj_subsys.kobj.parent = &class_obj_subsys.kobj;
 	return 0;