SCUMM: fix engine destructor

(This is relevant for cases where the engine errors out early, before certain arrays get initialized).

engines/scumm/scumm.cpp

@@ -161,7 +161,7 @@ ScummEngine::ScummEngine(OSystem *syst, const DetectorResult &dr)
 	_pauseDialog = NULL;
 	_versionDialog = NULL;
 	_fastMode = 0;
-	_actors = NULL;
+	_actors = _sortedActors = NULL;
 	_arraySlot = NULL;
 	_inventory = NULL;
 	_newNames = NULL;
@@ -586,9 +586,12 @@ ScummEngine::~ScummEngine() {
 
 	_mixer->stopAll();
 
-	for (int i = 0; i < _numActors; ++i)
-		delete _actors[i];
-	delete[] _actors;
+	if (_actors) {
+		for (int i = 0; i < _numActors; ++i)
+			delete _actors[i];
+		delete[] _actors;
+	}
+
 	delete[] _sortedActors;
 
 	delete[] _2byteFontPtr;
@@ -1367,6 +1370,7 @@ void ScummEngine::resetScumm() {
 #ifdef USE_RGB_COLOR
 	if (_game.features & GF_16BIT_COLOR
 #ifndef DISABLE_TOWNS_DUAL_LAYER_MODE
+
 		|| _game.platform == Common::kPlatformFMTowns
 #endif
 		)