Return immediately from ttwrite() if the ttysleep()s that wait for a clist return with an error.  There are some clist starvation/deadlock bugs elsewhere and killing clist hogs didn't help because the breaks only exited from the inner loops.
Return immediately from ttwrite() if the ttysleep()s that wait for
a clist return with an error.  There are some clist starvation/deadlock
bugs elsewhere and killing clist hogs didn't help because the breaks
only exited from the inner loops.

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