68de483bf3
when ray exceeds `max_bounce`, we do not allocate any closure at intersection. However, Ray Portal BSDF still added `SD_BSDF` flag, resulting in undefined behavior in `integrate_surface_bsdf_bssrdf_bounce()`. This part of code was similar to Transparent BSDF, however, Transparent closure was still allocated in this case. To fix the undefined behavior, add `SD_BSDF` flag only when the Ray Portal closure was allocated.
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