ntdll: Ignore invalid exit_frame when exiting thread.

[Alexandre Julliard]

Sebastian Lackner <sebastian at fds-team.de> writes:

> Signed-off-by: Sebastian Lackner <sebastian at fds-team.de>
> ---
>
> When applications switch to a custom stack, exit_frame is not necessarily
> valid anymore.

How does it become invalid? Does the app unmap the previous stack?

-- 
Alexandre Julliard
julliard at winehq.org