GSD-2022-1002874 exfat: check if cluster num is valid

exfat: check if cluster num is valid 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 v5.18.2 by commit 2193286402df2d9c53294f7a858d5e6fd7346e08,...