use-of-uninitialized-value in read user chunk callback

use-of-uninitialized-value in read user chunk callback: a task in MiMo-V2.6-RL-harbor-cyber: MiMo-V2.6-RL Cyber (Harbor) (Harbor dataset). MemorySanitizer: use-of-uninitialized-value in function read user chunk callback in file imagemagick/coders/png.c