acct: fix potential integer overflow in encodecompt()
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 v5.10.163 by commit 6edd0cdee5780fd5f43356b72b29a2a6d48ef6da. For more details please see the references link.