use-of-uninitialized-value in stun check message integrity by key str

use-of-uninitialized-value in stun check message integrity by key str: a task in MiMo-V2.6-RL-harbor-cyber: MiMo-V2.6-RL Cyber (Harbor) (Harbor dataset). MemorySanitizer: use-of-uninitialized-value in function stun check message integrity by key str in file coturn/src/client/ns turn msg.c