Blender Git Loki

Fix memory leaks when doing "Save & Quit"

Steps to reproduce were:
* Open Blender (no need for factory settings, "Promt Quit" needs to be enabled)
* Edit the file (e.g. translate some object)
* Quit Blender but don't skip quit promt
* Press "Save & Quit"
* Save the file

Not sure if Windows supports the "Save & Quit" behavior, so this may not have
applied to Windows.