Fix #676 - memory leak of IReadFile, by nathanm32292394

Reference to a, through IrrLicht, opened file wasn't getting closed.
Use IReadFile::drop() (derived from IReferenceCounted::drop()) to fix
this severe memory leak.


git-svn-id: svn+ssh://svn.code.sf.net/p/supertuxkart/code/main/trunk@11397 178a84e3-b1eb-0310-8ba1-8eac791a3b58

src/graphics/irr_driver.cpp

@@ -667,7 +667,8 @@ scene::IAnimatedMesh *IrrDriver::getAnimatedMesh(const std::string &filename)
         file_system->getFileArchive(file_system->getFileArchiveCount()-1);
         io::IReadFile* content = zip_archive->createAndOpenFile(0);
         m = m_scene_manager->getMesh(content);
-        
+        content->drop();
+
         file_system->removeFileArchive(file_system->getFileArchiveCount()-1);
     }
     else