audio/pulseaudio: parse /dev/sndstat correctly to get device name

This provides nice human-readable strings for devices in PA-
aware applications (e.g. Firefox shows something nicer than "pcm0").

This bumps PORTREVISION again, even though there's a sequence
of PA updates and fixes (which could conceivably be mashed into
a single PORTREVISION increase).

PR: 245156
Provided by: Henry Hu (original patches)
Provided by: lightside (v3 patches)