Fix issue with noise during startup
After migrating to SDL2 interfaces there is noise during startup fix
this by initializng buffer as specification requires.
Per SDL_AudioCallback spec:
The callback must completely initialize the buffer; as of SDL 2.0, this buffer is not initialized before the callback is called. If there is nothing to play, the callback should fill the buffer with silence.
Signed-off-by: Amadeusz Sławiński <amade@asmblr.net>
git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@12480
d7cf8633-e32d-0410-b094-
e92efae38249