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

Defect 73042 (STATIC_C)
Checker CHECKED_RETURN (subcategory none)
File: /src/mongo/db/exec/fetch.cpp
Function mongo::FetchStage::doRestoreState()
/src/mongo/db/exec/fetch.cpp, line: 169
Calling "restore" without checking return value (as is done elsewhere 7 out of 13 times).

            _cursor->restore();