Blender Git Commit Log

Cleanup: readfile for workspaces: NULLify non-owned data pointers.

`workspace_hook` of wmWindows store pointers for runtime data and to
data belonging to other IDs (workspace's layouts). That kind of pointers
should always be cleaned up on read, it allows for cleaner segfault
crash in case of mistakes in code updating/re-setting them, and avoids
potential security issue of accessing random memory address.

No behavioral change expected here.