fix wrong call and missing send set

models/dmx.go

@@ -1,6 +1,8 @@
 package models
 
-import "sync"
+import (
+	"sync"
+)
 
 type DMX struct {
 	Data []byte
@@ -17,7 +19,7 @@ func (d *DMX) GetDMXData() (data []byte) {
 	d.mu.Lock()
 	data = d.Data
 	d.mu.Unlock()
-	return data
+	return
 }
 
 func (d *DMX) SetValue(channel uint, value uint8) {