Summary:
Fix a set of bugs introduced by WT-5324 where functions had va_start calls but could return without processing their matching va_end calls. Unlikely to cause problems anywhere, the va_end arguments aren't necessary and the only time this fires is in places where applications have called the API in illegal ways.
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There are number of Coverity detected bugs with similar symptoms:

https://coverity.corp.mongodb.com/reports.htm#v15444/p10049/fileInstanceId=28572217&defectInstanceId=19264731&mergedDefectId=114012

https://coverity.corp.mongodb.com/reports.htm#v15444/p10049/fileInstanceId=28572213&defectInstanceId=19264729&mergedDefectId=114011

https://coverity.corp.mongodb.com/reports.htm#v15444/p10049/fileInstanceId=28572210&defectInstanceId=19264728&mergedDefectId=114010

https://coverity.corp.mongodb.com/reports.htm#v15444/p10049/fileInstanceId=28572213&defectInstanceId=19264732&mergedDefectId=114009

https://coverity.corp.mongodb.com/reports.htm#v15444/p10049/fileInstanceId=28572212&defectInstanceId=19264733&mergedDefectId=114008

https://coverity.corp.mongodb.com/reports.htm#v15444/p10049/fileInstanceId=28572210&defectInstanceId=19264734&mergedDefectId=114007

https://coverity.corp.mongodb.com/reports.htm#v15444/p10049/fileInstanceId=28572217&defectInstanceId=19264730&mergedDefectId=114006