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 v5.15.68 by commit 58acd2ebae034db3bacf38708f508fbd12ae2e54. For more details please see the references link.