Unsigned compared against 0

An unsigned value can never be negative, so this test will always evaluate the same way. An unsigned value can never be less than 0
/src/mongo/s/write_ops/unified_write_executor/write_batch_response_processor.cpp:799: NO_EFFECT 176989 This greater-than-or-equal-to-zero comparison of an unsigned value is always true. "this->_nModified >= 0UL".