use-of-uninitialized-value in pixGetCmapHistogramInRect

use-of-uninitialized-value in pixGetCmapHistogramInRect: a task in MiMo-V2.6-RL-harbor-cyber: MiMo-V2.6-RL Cyber (Harbor) (Harbor dataset). MemorySanitizer: use-of-uninitialized-value in function pixGetCmapHistogramInRect in file leptonica/src/pix4.c