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:
> [markedText release];
>          [glContexts release];
>          [pendingGlContexts release];
> -        CGImageRelease(colorImage);
> -        CGImageRelease(shapeImage);
> +        CFRelease(_IOSurface);

It's unlikely `_IOSurface` would be NULL here, but might as well add a NULL check here too

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https://gitlab.winehq.org/wine/wine/-/merge_requests/7938#note_124837