OT: What causes the Segfault in the following?

[Kagamin via Digitalmars-d-learn]

On Friday, 4 August 2017 at 02:38:10 UTC, Andrew Edwards wrote:
> OK, I was is indeed the problem. I was thinking for some reason 
> that s gets initialized inside nk_color_hex_rgb()

Usually C functions don't allocate memory. And when they do, they 
do it in unique ways, which is a PITA, that's why the caller is 
usually responsible for memory management.