9p: fix fid refcount leak in v9fsvfsatomicopendotl
This is an automated ID intended to aid in discovery of potential security vulnerabilities. The actual impact and attack plausibility have not yet been proven. This ID is fixed in Linux Kernel version v5.15.51 by commit 22832ac3eb5be3f7168816a76b64c1284e12eb3c, it was introduced in version v5.11 by commit 6636b6dcc3db2258cd0585b8078c1c225c4b6dde. For more details please see the references link.