ES1938 driver

Playing Quake1 (quakeforge-flavor with ALSA-driver) I hear cracks and blibs.
Other apps (xine, mpg321) are fine. The OSS driver in 2.6.7 produces no
cracks (but reverses stereo BTW).

I fixed it, i.e. it works for me:

*No swapping of stereo channels
*no cracks

Signed-off-by: <maps4711@gmx.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>