bug#43973: 28.0.50; [NS] Two crashes on macOS

[Alan Third]

On Tue, Oct 13, 2020 at 03:00:31PM +0200, Robert Pluim wrote:
> 
> (lldb) bt
> * thread #1, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS 
> (code=1, address=0x20)
>   * frame #0: 0x00007fff6be26678 libobjc.A.dylib`objc_release + 24
>     frame #1: 0x00000001001f5d1f emacs`-[EmacsImage 
> dealloc](self=0x0000000102ac8ff0, _cmd=<unavailable>) at nsimage.m:286:3 [opt]
<snip>
> 
> which is nsimage.m:
> 
> - (void)dealloc
> {
>   [stippleMask release];
>   [bmRep release];
>   [transform release];  <====
>   [super dealloc];
> }
> 
> Alan?

Are you sure it's crashing on that line? That makes no sense as
there's nowhere else that can release the transform, and if the image
doesn't have a transform set it should be nil so releasing it would be
a no-op... 

But even if it's a neighbouring line, I can't see why that would be
happening...

I have no ideas.
-- 
Alan Third