Code can never be reached because of a logical contradiction

Defect 73173 (STATIC_C)
Checker DEADCODE (subcategory none)
File: /src/mongo/db/modules/enterprise/src/sasl/auxprop_mongodb_internal.cpp
Function mongo::<unnamed>::auxpropLookupMongoDBInternal(void *, sasl_server_params *, unsigned int, const char *, unsigned int)
/src/mongo/db/modules/enterprise/src/sasl/auxprop_mongodb_internal.cpp, line: 166
Assigning: "curRet" = "-20".

                curRet = SASL_NOUSER;

/src/mongo/db/modules/enterprise/src/sasl/auxprop_mongodb_internal.cpp, line: 182
At condition "curRet != -20", the value of "curRet" must be equal to -20.

            if (curRet != SASL_OK && curRet != SASL_NOUSER) {

/src/mongo/db/modules/enterprise/src/sasl/auxprop_mongodb_internal.cpp, line: 182
The condition "curRet != -20" cannot be true.

            if (curRet != SASL_OK && curRet != SASL_NOUSER) {

/src/mongo/db/modules/enterprise/src/sasl/auxprop_mongodb_internal.cpp, line: 183
Execution cannot reach this statement: "break;".

                break;