use-of-uninitialized-value in fz adjust ft glyph width

use-of-uninitialized-value in fz adjust ft glyph width: a task in MiMo-V2.6-RL-oss: Agentic RL Environments (MiMo RL release). MemorySanitizer: use-of-uninitialized-value in function fz adjust ft glyph width in file mupdf/source/fitz/font.c