Fixed some game crashes which occurred when ProjectReader::purgeCache() got called:

- MIDI music data is marked to be deleted in o1_STOPMUS now, instead of o1_PLAYMUS. 
- Added a FIXME to Screen::setFont() - purgeCache crashes the game if the active font is deleted

svn-id: r31948

1 files changed, 6 insertions, 4 deletions

diff --git a/engines/made/scriptfuncs_mhne.cpp b/engines/made/scriptfuncs_mhne.cpp
index 4c942edec2..748bce3918 100644
--- a/engines/made/scriptfuncs_mhne.cpp
+++ b/engines/made/scriptfuncs_mhne.cpp
@@ -233,15 +233,17 @@ int16 ScriptFunctionsMhne::o1_PLAYSND(int16 argc, int16 *argv) {
 int16 ScriptFunctionsMhne::o1_PLAYMUS(int16 argc, int16 *argv) {
 	int16 musicNum = argv[0];
 	if (musicNum > 0) {
-		GenericResource *xmidi = _vm->_res->getXmidi(musicNum);
-		_vm->_music->playXMIDI(xmidi);
-		_vm->_res->freeResource(xmidi);
+		_xmidiRes = _vm->_res->getXmidi(musicNum);
+		_vm->_music->playXMIDI(_xmidiRes);
 	}
 	return 0;
 }
 
 int16 ScriptFunctionsMhne::o1_STOPMUS(int16 argc, int16 *argv) {
-	_vm->_music->stop();
+	if (_vm->_music->isPlaying()) {
+		_vm->_music->stop();
+		_vm->_res->freeResource(_xmidiRes);
+	}
 	return 0;
 }