Fix compilation warning in jemalloc's malloc_vsnprintf (#7789)
Change `val` to `unsigned char` before being tested. The fix is identical to the one that's been made in upstream jemalloc. warning is: src/malloc_io.c: In function ‘malloc_vsnprintf’: src/malloc_io.c:369:2: warning: case label value exceeds maximum value for type 369 | case '?' | 0x80: \ | ^~~~ src/malloc_io.c:581:5: note: in expansion of macro ‘GET_ARG_NUMERIC’ 581 | GET_ARG_NUMERIC(val, 'p'); | ^~~~~~~~~~~~~~~
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