integrity: Fix memory leakage in keyring allocation error path
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 v5.15.86 by commit 29d6c69ba4b96a1de0376e44e5f8b38b13ec8803, it was introduced in version v4.12 by commit 2b6aa412ff23a02ac777ad307249c60a839cfd25. For more details please see the references link.