heap-use-after-free in ~ScDocument

[Noel Grandin]

 ---- On Fri, 09 Aug 2024 13:31:31 +0200  Stephan Bergmann  wrote --- 
 > with an (Linux ASan) master build from earlier today, 
 > JunitTest_svx_unoapi seems to fail in various unclear ways, but at least 
 > one attempt showed a

I have run that test on loop for 2 hours with no failures (in my ubsan workspace).

blind attempt at fix here: https://gerrit.libreoffice.org/c/core/+/171791