Coverity found a Quality issue: Improper use of negative value

Details:

Coverity Issue ID: 183871
Issue Description: Negative value can be returned from function is not being checked before being used improperly
Potential Impact: The negative value may be unexpected by later operations, causing incorrect computations.
Coverity checker: NEGATIVE_RETURNS
Branch: v8.0
File path: /src/mongo/db/repl/replication_coordinator_impl.cpp
Line number: Unknown

What Coverity Detected (Main Finding)

"this->_selfIndex" is passed to a parameter that cannot be negative.

The issue can be viewed in Coverity here.

How do I fix this?

Refer to https://wiki.corp.mongodb.com/spaces/HGTC/pages/385852267/Guidance+on+fixing+Coverity+issues for guidance on fixing Coverity issues.

Note: This issue was found on the v8.0 branch. If a fix is needed, you must create a BACKPORT ticket following the Server BACKPORT policy