warning C4244 in newly added function 'utf8proc_charwidth_ambiguous' when updating to 2.10

[simonedi]

Hi,

I am updating utf8proc library from 2.9 to 2.10.
When I compile using Visual Studio 2022 17.10.10, I am facing a new warning in newly added function 'utf8proc_charwidth_ambiguous' of release 2.10.

utf8proc.c(436,34): warning C4244: 'return': conversion from 'const unsigned int' to 'utf8proc_bool', possible loss of data

This problem also occurs using Visual Studio 2022 17.12.4 and Visual Studio 2019 16.11.43.

[eschnett]

The code is correct. Data loss cannot happen there. I assume that a respective cast would avoid the warning.