Driver core: remove subsys_get()

There are no more subsystems, it's a kset now so remove the function and
the only two users, which are in the driver core.


Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/lib/kobject.c b/lib/kobject.c
index 0aa4e90..1326041 100644
--- a/lib/kobject.c
+++ b/lib/kobject.c
@@ -679,7 +679,7 @@
 	if (!s || !a)
 		return -EINVAL;
 
-	if (subsys_get(s)) {
+	if (kset_get(s)) {
 		error = sysfs_create_file(&s->kobj, &a->attr);
 		kset_put(s);
 	}