aio_poll() assertion fail on Windows

[Mark Cave-Ayland]

Whilst testing a Windows build of git master of qemu-system-ppc in MSYS2/MingW64 I 
noticed the following assertion message in the console after booting into OpenBIOS 
and then closing the GTK GUI window without booting a client OS:

$ ./qemu-system-ppc
**
ERROR:../util/aio-win32.c:337:aio_poll: assertion failed: 
(in_aio_context_home_thread(ctx))
Bail out! ERROR:../util/aio-win32.c:337:aio_poll: assertion failed: 
(in_aio_context_home_thread(ctx))

Has anyone else seen this at all?


ATB,

Mark.