drm/amd/display: fix memory leak when using debugfs_lookup()
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 v5.19.9 by commit 3a6279d243cb035eaaff1450980b40cf19748f05. For more details please see the references link.