use-of-uninitialized-value in mywcslen

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