K 10
svn:author
V 3
des
K 8
svn:date
V 27
2005-10-30T10:03:11.000000Z
K 7
svn:log
V 501
Add some safeguards to AIOSFMT:

 - Return EINVAL if play_format or rec_format is set but the corresponding
   sample rate is 0.

 - Don't try to set the playback or recording format to 0.  Previously,
   issuing an AIOSFMT ioctl with an all-zeroes snd_chan_param would
   trigger a KASSERT in chn_fmtchain(); I'm unsure about the effects on
   a kernel without INVARIANTS.  After this commit, issuing AIOSFMT with
   an all-zeroes snd_chan_param is equivalent to issuing AIOGFMT.

MFC after:	2 weeks

END