bluez: fix blocking on startup

package/bluez/files/bluez.init

@@ -11,7 +11,7 @@ autostart)
 	exec sh $0 start
 	;;
 start)
-	/usr/libexec/bluetooth/bluetoothd &
+	/usr/libexec/bluetooth/bluetoothd >/dev/null 2>&1 &
 	;;
 stop)
 	kill $(pgrep -f /usr/libexec/bluetooth/bluetoothd)