GSD-2022-1003554 dlm: fix plock invalid read

dlm: fix plock invalid read 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 v5.10.121 by commit 899bc4429174861122f0c236588700a4710c1fec, it was...