Coverity analysis defect 71441: PW.USELESS_TYPE_QUALIFIER_ON_RETURN_TYPE

A new defect has been detected and assigned to renctan in Coverity Connect.
http://coverity.mongodb.com//sourcebrowser.htm?projectId=10001#mergedDefectId=71441
The defect was flagged by checker PW.USELESS_TYPE_QUALIFIER_ON_RETURN_TYPE in
file /src/mongo/s/type_chunk.h
function None
and this ticket was created by spencer.jackson@10gen.com