If a driver calls AttendClient() from within a timer callback we
need to re-compute the local 'are_ready' to prevent the attended
client from waiting until WaitForSomething() times out.
This is a fix similar to commit 9ed5b263.
Signed-off-by: Damien Leone <dleone@nvidia.com>
Reviewed-by: Keith Packard <keithp@keithp.com>
(cherry picked from commit f33cb42643)