Fix audio playback aborted with SNDCTL_DSP_SETTRIGGER, affecting PortAudio version 19.
Fix audio playback aborted with SNDCTL_DSP_SETTRIGGER, affecting
PortAudio version 19.

PR:		kern/118395
Submitted by:	Henrik Gulbrandsen <henrik at gulbra dot net>
Approved by:	re (kensmith)

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