Assignment of a variable or expression to itself has no effect

Defect 103494 (STATIC_C)
Checker NO_EFFECT (subcategory self_assign)
File: /src/mongo/db/free_mon/free_mon_processor.cpp
Function mongo::RegistrationRetryCounter::incrementError()
/src/mongo/db/free_mon/free_mon_processor.cpp, line: 83
Assigning "this->_base" to itself has no effect.

            _base = _base;