Put "CourseMode" barriers in a couple more places in AdjustSync.

Although AdjustSync would not alter anything in CourseMode, it would
sometimes announce it had.  It would be better to simply remove the
Autosync line from the options in CourseMode, but I don't know how to
do that.

stepmania/src/AdjustSync.cpp

@@ -122,6 +122,8 @@ static LocalizedString AUTOSYNC_MACHINE			( "AdjustSync", "Autosync Machine" );
 static LocalizedString AUTOSYNC_TEMPO			( "AdjustSync", "Autosync Tempo" );
 void AdjustSync::HandleAutosync( float fNoteOffBySeconds, float fStepTime )
 {
+	if( GAMESTATE->IsCourseMode() )
+		return;
 	switch( GAMESTATE->m_SongOptions.GetCurrent().m_AutosyncType ) {
 	case SongOptions::AUTOSYNC_OFF:
 		return;
@@ -150,6 +152,8 @@ void AdjustSync::HandleAutosync( float fNoteOffBySeconds, float fStepTime )
 
 void AdjustSync::HandleSongEnd()
 {
+	if( GAMESTATE->IsCourseMode() )
+		return;
 	if( GAMESTATE->m_SongOptions.GetCurrent().m_AutosyncType == SongOptions::AUTOSYNC_TEMPO )
 	{
 		AutosyncTempo();
@@ -160,7 +164,6 @@ void AdjustSync::HandleSongEnd()
 
 void AdjustSync::AutosyncOffset()
 {
-
 	const float mean = calc_mean( s_fAutosyncOffset, s_fAutosyncOffset+OFFSET_SAMPLE_COUNT );
 	const float stddev = calc_stddev( s_fAutosyncOffset, s_fAutosyncOffset+OFFSET_SAMPLE_COUNT );
 
@@ -208,7 +211,10 @@ void AdjustSync::AutosyncTempo()
 	float fIntercept = 0.0f;
 	if( !CalcLeastSquares( s_vAutosyncTempoData,
 	                       &fSlope, &fIntercept, &s_fAverageError ) )
+	{
+		s_vAutosyncTempoData.clear();
 		return;
+	}
 
 	if( s_fAverageError < ERROR_TOO_HIGH )
 	{