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nusb/audio: remove code for bi-directional endpoint

Isochronous endpoints are never bi-directional.

--- a/sys/src/cmd/nusb/audio/audio.c

+++ b/sys/src/cmd/nusb/audio/audio.c

@@ -103,7 +103,7 @@

 	Range *f;

 	for(;e != nil; e = e->next){

-		if(e->dir!=dir && e->dir!=Eboth)

+		if(e->dir!=dir)

 			continue;

 		c = e->iface->aux;

 		if(c == nil)

@@ -177,7 +177,7 @@

 			return;

 		}

 		closedev(d);

-		if(audioepin != nil && audioepin != audioepout)

+		if(audioepin != nil)

 			if(d = setupep(audiodev, audioepin, speed))

 				closedev(d);

 		audiofreq = speed;

@@ -242,14 +242,6 @@

 				if(audioepout != nil)

 					continue;

 				audioepout = e;

-				break;

-			case Eboth:

-				if(audioepin != nil && audioepout != nil)

-					continue;

-				if(audioepin == nil)

-					audioepin = e;

-				if(audioepout == nil)

-					audioepout = e;

 				break;

 			}

 			if((ed = setupep(audiodev, e, audiofreq)) == nil){