lost patch to cleanup/cancel code?

[Vladimir Nesic]

> At least a week ago someone posted or email me a one line
> patch to what I remember being the POSIX cancel or cleanup
> routines.  But I can't find it anymore.  Could someone please
> repost it so I can review and commit it?
>
> THanks.

This is the patch. I am not sure that it is 100% safe, but my aplication 
stopped crashing after the change.

------------ Original message: -----------------

I have found an error preventing pthread_cleanup_pop() and  
_POSIX_Thread_cancel_run() from running correctly.

In both functions I have changed line:

handler = (POSIX_Cancel_Handler_control *) _Chain_Tail( handler_stack );

to:

handler = (POSIX_Cancel_Handler_control *) _Chain_Tail( handler_stack 
)->previous;

and now everything seams to work OK.

Vlada