fixed crash in processAudioBuffer when notePlayHandle was NULL (crashed certain instruments like sf2)

git-svn-id: https://lmms.svn.sf.net/svnroot/lmms/trunk/lmms@1936 0778d3d1-df1d-0410-868b-ea421aaaa00d

ChangeLog

@@ -15,6 +15,10 @@
 	- shift drag on an unselected note didn't work (FIXED)
 	- added a note detuning tool
 	- fixed mouse cursor glitch when mousing over notes
+	
+	* src/tracks/instrument_track.cpp:
+	fixed crash in processAudioBuffer when notePlayHandle was NULL
+	(crashed certain instruments like sf2)
 
 2008-12-14	Andrew Kelley	<superjoe30/at/gmail/dot/com>
 

src/tracks/instrument_track.cpp

@@ -180,7 +180,8 @@ void instrumentTrack::processAudioBuffer( sampleFrame * _buf,
 								_frames,
 			( _n != NULL ) ? _n->offset() : 0,
 			panningToVolumeVector( 
-						(int) m_panningModel.value() + _n->getPanning(),
+						(int) m_panningModel.value() +
+								  ( _n != NULL ) ? _n->getPanning() : 0,
 						v_scale ),
 							 &m_audioPort );
 }