[PATCH] block: fix kobject leak in blk_unregister_queue

[Ming Lei <ming.lei@redhat.com>]

The kobject for the queue, `disk->queue_kobj`, is initialized with a
reference count of 1 via `kobject_init()` in `blk_register_queue()`.
While `kobject_del()` is called during the unregister path to remove
the kobject from sysfs, the initial reference is never released.

Add a call to `kobject_put()` in `blk_unregister_queue()` to properly
decrement the reference count and fix the leak.

Fixes: 2bd85221a625 ("block: untangle request_queue refcounting from sysfs")
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
---
 block/blk-sysfs.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
index b2b9b89d6967..c611444480b3 100644
--- a/block/blk-sysfs.c
+++ b/block/blk-sysfs.c
@@ -960,4 +960,5 @@ void blk_unregister_queue(struct gendisk *disk)
 		elevator_set_none(q);
 
 	blk_debugfs_remove(disk);
+	kobject_put(&disk->queue_kobj);
 }
-- 
2.47.0