[PATCH] readline_simple: Fix compiler warning

[Sascha Hauer]

On Wed, May 12, 2021 at 01:25:14PM +0200, Michael Olbrich wrote:
> On Wed, May 12, 2021 at 07:44:40AM +0200, Sascha Hauer wrote:
> > char is an unsigned type.
> 
> That's incorrect. In the C standard it is explicitly undefined whether char
> is signed or unsigned. gcc implements this differently depending on the
> architecture. I think ARM and x86 differ here.

Ok. I already reworded this to "char can be an unsigned type".

Sascha

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