Handle assert init/quit better.
Handle assert init/quit better.

Don't create a mutex unles we need to, only clean it up if we made it.


git-svn-id: 75429ccc2030f235ccf16e6b9b7f8e83d5edd22e@5502 c70aab31-4412-0410-b14c-859654838e24

albertz/sdl,albertz/sdl,albertz/sdl,albertz/sdl