NFSv4: Fix free of uninitialized nfs4_label on referral 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 v5.18.3 by commit 6015292653d95ba9f72906e2b65e536aa5807d64, it was introduced in version v5.16 by commit 9558a007dbc383d48e7f5a123d0b5ff656c71068. For more details please see the references link.