UVI-2021-1002330 f2fs: fix incorrect return value in f2fs_sanity_check_ckpt()

f2fs: fix incorrect return value in f2fssanitycheckckpt 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 v5.15.5 by commit...