use-of-uninitialized-value in EncoderSession finish ok

use-of-uninitialized-value in EncoderSession finish ok: a task in MiMo-V2.6-RL-oss: Agentic RL Environments (MiMo RL release). MemorySanitizer: use-of-uninitialized-value in function EncoderSession finish ok in file flac/src/flac/encode.c