Fix ramdisk driver leak on module unload.

Noticed by me, fixed by Jens.

drivers/block/rd.c

@@ -316,6 +316,7 @@ static void __exit rd_cleanup(void)
 		}
 		del_gendisk(rd_disks[i]);
 		put_disk(rd_disks[i]);
+		blk_cleanup_queue(rd_queue[i]);
 	}
 	devfs_remove("rd");
 	unregister_blkdev(RAMDISK_MAJOR, "ramdisk");