Serial: Bug when disabling? about simpleiot

[cbrake]

fixed in the feature-serial-perf branch -- thanks!

			for _, p := range pts.Points {
				// check if any of the config changes should cause us to re-open the port
				if p.Type == data.PointTypePort ||
					p.Type == data.PointTypeBaud ||
					p.Type == data.PointTypeDisable ||
					p.Type == data.PointTypeMaxMessageLength {
					op = true
				}

				if p.Type == data.PointTypePort {
					err := watcher.Add(filepath.Dir(p.Text))
					if err != nil {
						log.Println("Error adding watcher on serial port name change: ", p.Text)
					}
				}

				if p.Type == data.PointTypeDisable {
					if p.Value == 0 {
						closePort()
					} else {
						op = true
					}
				}
			}
``