Revert "rnbd-clt: fix refcount underflow in device unmap path"

This reverts commit ec19ed2b3e2af8ec5380400cdee9cb6560144506.

This commit relies on changes queued for 7.0, and isn't safe in its
current form for the 6.19 release. Revert it for now for 6.19.

Link: https://lore.kernel.org/linux-block/aXhLQmRudk7cSAnT@shinmob/
Signed-off-by: Jens Axboe <[e-mail]>

drivers/block/rnbd/rnbd-clt.c

···
 			/* To avoid deadlock firstly remove itself */
 			sysfs_remove_file_self(&dev->kobj, sysfs_self);
 		kobject_del(&dev->kobj);
+		kobject_put(&dev->kobj);
 	}
 }