Log Message:
Remove assert to enable alsa-plugins-oss audio playback. Bump PKGREVISION

Your NetBSD system should have ~/.asoundrc like as follows.
However OSS audio playback is not ver stable.

pcm.oss {
	type oss
	device /dev/audio
}

pcm.!default {
	type plug
	slave {
		pcm oss
		format S16_LE
	}
}

ctl.!default {
        type oss
        device /dev/mixer
}