Value returned from a function is not checked for errors before being used

Defect 104983 (STATIC_C)
Checker CHECKED_RETURN (subcategory none)
File: /src/mongo/transport/service_executor_reserved.cpp
Function mongo::transport::ServiceExecutorReserved::_startWorker()::[lambda() (instance 1)]::operator ()() const::[lambda() (instance 1)]::operator ()() const
/src/mongo/transport/service_executor_reserved.cpp, line: 90
Calling "subtractAndFetch" without checking return value (as is done elsewhere 3 out of 6 times).

                _numRunningWorkerThreads.subtractAndFetch(1);