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audioac97: set adc rate

set adc (recording) sample rate the same as playback for now.
make these separate entries later when we reintroduce in/out
attributes to volume controls.

--- a/sys/src/9/pc/audioac97mix.c

+++ b/sys/src/9/pc/audioac97mix.c

@@ -185,8 +185,10 @@

 			return 0;

 		}

 		m->wr(adev, vol->reg, a[0]);		

-		if(x == Vspeed)

+		if(x == Vspeed){

+			m->wr(adev, 0x32, a[0]);	/* adc rate */

 			adev->speed = m->rr(adev, vol->reg);

+		}

 		break;

 	case Left:

 		v = (vol->range - a[0]) & 0x7f;