use-of-uninitialized-value in fz load bmp subimage count

use-of-uninitialized-value in fz load bmp subimage count: a task in MiMo-V2.6-RL-oss: Agentic RL Environments (MiMo RL release). MemorySanitizer: use-of-uninitialized-value in function fz load bmp subimage count in file mupdf/source/fitz/load-bmp.c