ovl: fix leaked dentry
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 v5.12.2 by commit d587cfaef72b1b6f4b2774827123bce91f497cc8, it was introduced in version v5.8 by commit 6815f479ca90ee7fd2e28b2a420f796b974155fe. For more details please see the references link.