Fix issue reported by heap debugger

Subsystems are erased by the subsystem manager - so better avoid
dependencies in their destructors.

diff --git a/src/Scenery/tilemgr.cxx b/src/Scenery/tilemgr.cxx
index dae8cb3b501fd977876ee3086cee704dbb4e4c89..6eeb706679077d70b36065859b277f8e9ecf7c13 100644 (file)
--- a/src/Scenery/tilemgr.cxx
+++ b/src/Scenery/tilemgr.cxx
@@ -87,9 +87,6 @@ FGTileMgr::FGTileMgr():
 
 FGTileMgr::~FGTileMgr()
 {
-    if (_terra_sync)
-        _terra_sync->setTileCache(NULL);
-
     // remove all nodes we might have left behind
     osg::Group* group = globals->get_scenery()->get_terrain_branch();
     group->removeChildren(0, group->getNumChildren());