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dbe: Fix use-after-free when closing (or resetting) the server

Peter Harris requested to merge peterh/xserver:dbe into master

The extension close functions are called before FreeAllResources. If DestroyWindow is unwrapped before FreeAllResources, this can lead to a dangling dbeWindow if the Window is freed before the dbeWindow is freed.

This also unwraps the DestroyWindow of any other extension that is initialized after dbe.

Avoid the use-after-free by unwrapping in CloseScreen instead of in the extension close function.

Signed-off-by: Peter Harris pharris@opentext.com

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