SAGA: Add comments about possibly race conditions to timer callbacks.

(cherry picked from commit 93f627441ac68e7a4c3e7f748a7b6f999bd9c96a)

engines/saga/interface.cpp

@@ -332,6 +332,9 @@ void Interface::saveReminderCallback(void *refCon) {
 }
 
 void Interface::updateSaveReminder() {
+	// CHECKME: This is potentially called from a different thread because it is
+	// called from a timer callback. However, it does not seem to take any
+	// precautions to avoid race conditions.
 	if (_active && _panelMode == kPanelMain) {
 		_saveReminderState = _saveReminderState % _vm->getDisplayInfo().saveReminderNumSprites + 1;
 		drawStatusBar();

engines/saga/music.cpp

@@ -224,6 +224,9 @@ void Music::musicVolumeGaugeCallback(void *refCon) {
 }
 
 void Music::musicVolumeGauge() {
+	// CHECKME: This is potentially called from a different thread because it is
+	// called from a timer callback. However, it does not seem to take any
+	// precautions to avoid race conditions.
 	int volume;
 
 	_currentVolumePercent += 10;

engines/saga/puzzle.cpp

@@ -399,6 +399,9 @@ void Puzzle::hintTimerCallback(void *refCon) {
 }
 
 void Puzzle::solicitHint() {
+	// CHECKME: This is potentially called from a different thread because it is
+	// called from a timer callback. However, it does not seem to take any
+	// precautions to avoid race conditions.
 	int i;
 
 	_vm->_actor->setSpeechColor(1, kITEColorBlack);

engines/saga/render.cpp

@@ -276,6 +276,9 @@ void Render::fpsTimerCallback(void *refCon) {
 }
 
 void Render::fpsTimer() {
+	// CHECKME: This is potentially called from a different thread because it is
+	// called from a timer callback. However, it does not seem to take any
+	// precautions to avoid race conditions.
 	_fps = _renderedFrameCount;
 	_renderedFrameCount = 0;
 }