Function stbi__malloc_mad2

lite/example/cpp_example/mge/cv/stb_image.h:1074–1078

mallocs with size overflow checking

        !defined(STBI_NO_HDR)
// mallocs with size overflow checking
static void* stbi__malloc_mad2(int a, int b, int add) {
    if (!stbi__mad2sizes_valid(a, b, add))
        return NULL;
    return stbi__malloc(a * b + add);
}
#endif

static void* stbi__malloc_mad3(int a, int b, int c, int add) {