This commit fixes two different issues actually: * When view name is unknown/irrelevant, you should pass a NULL str pointer to `RE_RenderLayerGetPass()`, not an empty string! * `render_result_rescale()` would unconditionnaly free re->result (at the end), even if it did not replaced it at all, leading to freed memory access later. This is only a partial fix though, "CacheBuffer" (i.e. saving tiles in EXR files) shall not be used in 3DView rendering, and yet it is here...