kobject: convert main fs kobject to use kobject_create

This also renames fs_subsys to fs_kobj to catch all current users with a
build error instead of a build warning which can easily be missed.


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

diff --git a/include/linux/fs.h b/include/linux/fs.h
index b3ec4a4..21398a5 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1476,7 +1476,7 @@
 extern int vfs_statfs(struct dentry *, struct kstatfs *);
 
 /* /sys/fs */
-extern struct kset fs_subsys;
+extern struct kobject *fs_kobj;
 
 #define FLOCK_VERIFY_READ  1
 #define FLOCK_VERIFY_WRITE 2