ALSA: ctxfi - Fix possible buffer pointer overrun

Fix possible buffer pointer overruns.  Back to zero when it's equal
or over the buffer size.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2009-06-08 15:07:46 +02:00
commit af8500bbbd