cbson: cleanup some warnings.
cbson: cleanup some warnings.

ajdavis/libbson,4Second2None/libbson_tmp,Convey-Compliance/libbson,Convey-Compliance/libbson,ksuarz/libbson,bjori/libbson,rcsanchez97/libbson,mongodb/libbson,mongodbinc-interns/libbson,mapr/libbson,mongodbinc-interns/libbson,rayyang2000/libbson,ajdavis/libbson,remicollet/libbson,Machyne/libbson,mongodbinc-interns/libbson,derickr/libbson,mapr/libbson,alexeyvo/libbson,rcsanchez97/libbson,mapr/libbson,remicollet/libbson,bjori/libbson,paulmelnikow/libbson,alexeyvo/libbson,alexeyvo/libbson,mongodb/libbson,ksuarz/libbson,rayyang2000/libbson,Machyne/libbson,4Second2None/libbson_tmp,Machyne/libbson,jqk6/libbson,remicollet/libbson,jqk6/libbson,paulmelnikow/libbson,derickr/libbson,4Second2None/libbson_tmp,paulmelnikow/libbson,paulmelnikow/libbson,ksuarz/libbson,rayyang2000/libbson,derickr/libbson,Convey-Compliance/libbson,rcsanchez97/libbson,mongodb/libbson,4Second2None/libbson_tmp,ajdavis/libbson,paulmelnikow/libbson,derickr/libbson,remicollet/libbson,Machyne/libbson,rayyang2000/libbson,jqk6/libbson,bjori/libbson,mongodbinc-interns/libbson,jqk6/libbson