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kernel/work: Fix race under with delayed work item cancellation
The call to unschedule_locked() would return true ("successfully unscheduled") even in the case where the underlying z_abort_timeout() failed (because the callback was already unpended and in-progress/complete/about-to-be-run, remember that timeout callbacks are unsynchronized), leading to state bugs and races against the callback behavior. Correctly detect that case and propagate the error to the caller. Fixes zephyrproject-rtos#51872 Signed-off-by: Andy Ross <andyross@google.com>
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