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nusb/ether: use setalt()

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

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

@@ -610,13 +610,9 @@

 				*eout = ep;

 		}

 		if(*ein != nil && *eout != nil)

-			goto Found;

+			return setalt(d, iface);

 	}

 	return -1;

-Found:

-	if(usbcmd(d, Rh2d|Rstd|Riface, Rsetiface, iface->alt, iface->id, nil, 0) < 0)

-		dprint(2, "%s: setalt ifc %d alt %d: %r\n", argv0, iface->id, iface->alt);

-	return 0;

 }

 int