Fix casting in our parse.y for unsigned char

Thread:: Fix casting in our parse.y for unsigned char

2022-12-15 15:00 Tracey Emery:
Fix casting in our parse.y for unsigned char
- 2022-12-15 15:06 Stefan Sperling:
  Fix casting in our parse.y for unsigned char
- 2022-12-15 15:08 Todd C. Miller:
  Fix casting in our parse.y for unsigned char
- - 2022-12-15 15:09 Tracey Emery:
    Fix casting in our parse.y for unsigned char