use-of-uninitialized-value in ycck cmyk convert

use-of-uninitialized-value in ycck cmyk convert: a task in MiMo-V2.6-RL-oss: Agentic RL Environments (MiMo RL release). MemorySanitizer: use-of-uninitialized-value in function ycck cmyk convert in file libjpeg-turbo/jdcolor.c