bug#56462: 29.0.50; [PATCH] Memory leak in ns_draw_relief

[Po Lu via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>]

Daniel Martín <mardani29@yahoo.es> writes:

> I ran the Leaks tool with Emacs 29, and I've found a memory leak in the
> NS version of Emacs.
>
> Since commit c7b48b61d08f0b6a08584080badc60fe62ba1db1, in function
> ns_draw_relief, static local variables baseCol and lightCol are assigned
> to nil separately to their declaration.  That has the subtle consequence
> that the further down calls to [baseCol release] and [lightCol release]
> become a no-op, so each time ns_draw_relief is called it leaks some
> instances of NSColor.
>
> The fix is to revert to the previous way those static variables were
> declared.
>
> I've attached a patch with the correction.  With this fix, the leaks
> tool doesn't report the NSColor leaks anymore when I play around with
> Emacs 29.

Thanks.  But I think the use of static variables there is rather ugly,
and it would be much nicer if we replicated the `x_setup_relief_color'
logic there.

Do you want to work on that, or should I?