The s > 2 branch in PSPSaveDialog::DoState has been dead code since it
was written - the section version was never raised past 2, so
ioThreadStatus was reset to SAVEIO_NONE on every savestate load.
Loading a state that was saved while a savedata operation was in
flight then repeated the operation (or left the dialog waiting on a
completion that had already happened), instead of resuming from the
recorded status.
Restoring the value is safe: DoState joins the IO thread before
serializing, so the stored status is only ever SAVEIO_NONE or
SAVEIO_DONE, and the operation's effects are already part of the
serialized emulated RAM. Old (v2) states still load through the reset
path.