Re: [PATCH v5 0/2] MR7938: Draft: winemac: Use IOSurface to update native window layers instead of CGImage.

[Brendan Shanks (＠bshanks)]

Brendan Shanks (@bshanks) commented about dlls/winemac.drv/cocoa_window.m:
> surfaceRect = rect;
>      }
>
> -    - (void) setColorImage:(CGImageRef)image
> +    - (void) setIOSurface:(IOSurfaceRef)image
>      {
> -        CGImageRelease(colorImage);
> -        colorImage = CGImageRetain(image);
> +        CFRelease(_IOSurface);

I got a crash here when `_IOSurface` was NULL, this needs a NULL check

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https://gitlab.winehq.org/wine/wine/-/merge_requests/7938#note_124836