[PATCH] sysfs: mount error path cleanup

Sysfs mount error path sanity work.  Perhaps we can panic here, but did not
want to disturb the code here.
Signed-off-by: Prasanna Meda <pmeda@akamai.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

fs/sysfs/mount.c

@@ -93,6 +93,7 @@ int __init sysfs_init(void)
 			printk(KERN_ERR "sysfs: could not mount!\n");
 			err = PTR_ERR(sysfs_mount);
 			sysfs_mount = NULL;
+			unregister_filesystem(&sysfs_fs_type);
 			goto out_err;
 		}
 	} else
@@ -101,5 +102,6 @@ int __init sysfs_init(void)
 	return err;
 out_err:
 	kmem_cache_destroy(sysfs_dir_cachep);
+	sysfs_dir_cachep = NULL;
 	goto out;
 }