Coverity analysis defect 45865: Resource leak

A new defect has been detected and assigned to benety.goh in Coverity Connect.
http://coverity.mongodb.com//sourcebrowser.htm?projectId=10001#mergedDefectId=45865
The defect was flagged by checker RESOURCE_LEAK in
file /src/mongo/db/storage/in_memory/in_memory_init.cpp
function mongo::_mongoInitializerFunction_InMemoryEngineInit(mongo::InitializerContext *)
and this ticket was created by milkie