SEGV in get tree codes

SEGV in get tree codes: a task in MiMo-V2.6-RL-oss: Agentic RL Environments (MiMo RL release). UndefinedBehaviorSanitizer: SEGV in function get tree codes in file ffmpeg/libavcodec/agm.c

The task

UndefinedBehaviorSanitizer: SEGV in function get_tree_codes in file ffmpeg/libavcodec/agm.c

Part of XiaomiMiMo/MiMo-V2.6-RL-oss.