use-of-uninitialized-value in file vprintf

use-of-uninitialized-value in file vprintf: a task in MiMo-V2.6-RL-oss: Agentic RL Environments (MiMo RL release). MemorySanitizer: use-of-uninitialized-value in function file vprintf in file file/src/funcs.c