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.