libbpf: Fix memory leak in strset
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 v5.14.12 by commit 9e8e7504e09831c469b67d6dc11d9a72654bdb8c, it was introduced in version v5.13 by commit 90d76d3ececc74bf43b2a97f178dadfa1e52be54. For more details please see the references link.