ovl: fix NULL pointer dereference in copy up warning
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 v5.16.6 by commit 9c7f8a35c5a83740c0e3ea540b6ad145c50d79aa, it was introduced in version v5.16 by commit 5b0a414d06c3ed2097e32ef7944a4abb644b89bd. For more details please see the references link.