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devaudio: attach

--- a/sys/src/9/port/devaudio.c

+++ b/sys/src/9/port/devaudio.c

@@ -116,7 +116,7 @@

 static Chan*

 audioattach(char *spec)

 {

-	static int first = 1;

+	static int attached = 0;

 	Audiochan *ac;

 	Audio *adev;

 	Chan *c;

@@ -127,7 +127,7 @@

 	else

 		i = 0;

 	for(adev = audiodevs; adev; adev = adev->next)

-		if(i-- == 0)

+		if(adev->ctlrno == i)

 			break;

 	if(adev == nil)

 		error(Enodev);

@@ -138,9 +138,10 @@

 	if((ac = audioclone(c, adev)) == nil)

 		error(Enomem);

-	if(first && adev->volwrite){

-		first = 0;

- 

+	i = 1<<adev->ctlrno;

+	if((attached & i) == 0 && adev->volwrite){

+		attached |= i;

+

 		strcpy(ac->buf, "speed 44100");

 		if(!waserror()){

 			adev->volwrite(adev, ac->buf, strlen(ac->buf), 0);