use-of-uninitialized-value in real to int16

use-of-uninitialized-value in real to int16: a task in MiMo-V2.6-RL-oss: Agentic RL Environments (MiMo RL release). MemorySanitizer: use-of-uninitialized-value in function real to int16 in file faad2/libfaad/lt predict.c