[PATCH] Fix -Wchar-subscripts warnings

[Sebastian Huber]

On 18/08/2020 17:31, Aschref Ben-Thabet wrote:

> From: Aschref Ben Thabet<aschref.ben-thabet at embedded-brains.de>
>
> The argument to the ctype functions must be an int and the value of the
> character must be representable as an unsigned char or equal to the
> value of the macro EOF. If the argument has any other value, the
> behavior is undefined.
Thanks, I checked in the patch.