Dereference of null pointer in spatial_modify make_nodelist

static nodelist *make_nodelist(arena* a, size_t bufsize)

{

    nodelist *r = (nodelist *) arena_alloc(a, sizeof(nodelist) + bufsize);

    if (r == nullptr) {

        return nullptr;

    }

    r = {};  <--- r is now null

    r->data.size = bufsize; <--- deref null

    r->data.buf = ((char *) r) + (sizeof(nodelist));

    return r;

}

*r = {};