f2fs: fix dereference of stale list iterator after loop body
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 v4.19.247 by commit 385edd3ce5b4b1e9d31f474a5e35a39779ec1110, it was introduced in version v4.12 by commit 8c242db9b8c01b252290e23827163787f07e01d1. For more details please see the references link.