Segmentation fault with lot of wagons

[rapenne-s]

Hi, I tried latest sl version from Nix pkgs, with a terminal more than 130 character wide if I use sl -134 I get a segmentation fault after the last wagon. I have no issue with 133 wagons, it starts at 134.

If I reduce the size of the terminal, I don't see the issue.

I didn't try all combinations of terminal size and wagon number because running this takes a lot of time.