[WINMM] always check for open and close enents in wave test

[Alexandre Julliard]

Robert Reif <reif at earthlink.net> writes:

> Fix CreateThread/waveOutOpen race by forcing parent thread to sleep
> which allows background thread to run and block before waveOutOpen is
> called.

If the background thread has to run for things to work, you need to
add a real synchronisation mechanism. A Sleep is not fixing anything,
it's just making the race condition less likely.

-- 
Alexandre Julliard
julliard at winehq.org