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audio: fill up last buffer with silence on close

--- a/sys/src/9/pc/audioac97.c

+++ b/sys/src/9/pc/audioac97.c

@@ -326,6 +326,20 @@

 	return p - (uchar*)vp;

 }

+static void

+ac97close(Audio *adev)

+{

+	Ctlr *ctlr;

+	Ring *ring;

+	uchar z[1];

+

+	z[0] = 0;

+	ctlr = adev->ctlr;

+	ring = &ctlr->outring;

+	while(ring->wi % Blocksize)

+		ac97write(adev, z, sizeof(z), 0);

+}

+

 static Pcidev*

 ac97match(Pcidev *p)

 {

@@ -499,6 +513,7 @@

 	ac97mixreset(adev, ac97mixw, ac97mixr);

 	adev->write = ac97write;

+	adev->close = ac97close;

 	adev->buffered = ac97buffered;

 	adev->status = ac97status;

-- 

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