fscrypt: fix keyring memory leak on mount failure
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 v5.15.78 by commit cff805b1518f38d57866065343db2285f2dcd5ab, it was introduced in version v5.15.78 by commit e6f4fd85ef1ee6ab356bfbd64df28c1cb73aee7e. For more details please see the references link.