mts: nonembeded mutex in TimeLocation

stream/mts/encoder.go

@@ -127,37 +127,39 @@ const (
 
 // timeLocation holds time and location data
 type timeLocation struct {
-	sync.RWMutex
+	mu       sync.RWMutex
 	time     uint64
 	location string
 }
 
 // SetTimeStamp sets the time field of a TimeLocation.
 func (tl *timeLocation) SetTimeStamp(t uint64) {
-	tl.Lock()
+	tl.mu.Lock()
 	tl.time = t
-	tl.Unlock()
+	tl.mu.Unlock()
 }
 
 // GetTimeStamp returns the location of a TimeLocation.
 func (tl *timeLocation) TimeStamp() uint64 {
-	tl.RLock()
-	defer tl.RUnlock()
-	return tl.time
+	tl.mu.RLock()
+	t := tl.time
+	tl.mu.RUnlock()
+	return t
 }
 
 // SetLocation sets the location of a TimeLocation.
 func (tl *timeLocation) SetLocation(l string) {
-	tl.Lock()
+	tl.mu.Lock()
 	tl.location = l
-	tl.Unlock()
+	tl.mu.Unlock()
 }
 
 // GetLocation returns the location of a TimeLocation.
 func (tl *timeLocation) Location() string {
-	tl.RLock()
-	defer tl.RUnlock()
-	return tl.location
+	tl.mu.RLock()
+	l := tl.location
+	tl.mu.RUnlock()
+	return l
 }
 
 // MetData will hold time and location data which may be set externally if