MSDN states that the function can only return one of DIERR_INVALIDPARAM,
DIERR_NOTINITIALIZED, DIERR_OTHERAPPHASPRIO, on error, and DI_OK, or
DI_NOEFFECT, on success.

Some games will try to call Acquire again in a tight loop and block the
main thread if DIERR_INPUTLOST is returned. There's a small chance for
this to happen with Resident Evil 2, whenever a joystick is plugged,
then quickly unplugged.
Signed-off-by: Rémi Bernon <rbernon@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>