use-of-uninitialized-value in UA base64

use-of-uninitialized-value in UA base64: a task in MiMo-V2.6-RL-harbor-cyber: MiMo-V2.6-RL Cyber (Harbor) (Harbor dataset). MemorySanitizer: use-of-uninitialized-value in function UA base64 in file open62541/deps/base64.c