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nusb: use ep->addr instead of ep->id in unstall() library function

this is not a bug, but using ep->addr makes the intend more clear.

--- a/sys/src/cmd/nusb/lib/dev.c

+++ b/sys/src/cmd/nusb/lib/dev.c

@@ -481,7 +481,7 @@

 	else

 		dir = 0;

 	r = Rh2d|Rstd|Rep;

-	if(usbcmd(dev, r, Rclearfeature, Fhalt, (ep->id&0xF)|dir, nil, 0)<0){

+	if(usbcmd(dev, r, Rclearfeature, Fhalt, (ep->addr&0xF)|dir, nil, 0)<0){

 		werrstr("unstall: %s: %r", ep->dir);

 		return -1;

 	}