Alsa: revise latency use and calculations, since the latency should be...
Alsa: revise latency use and calculations, since the latency should be equivalent to one Alsa period less than the Alsa ringbuffer (was based on the whole). Also fixes failure if zero latency was specified. git-svn-id: https://subversion.assembla.com/svn/portaudio/portaudio/trunk@1893 0f58301d-fd10-0410-b4af-bbb618454e57
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