bson: no need to use variable for nofree flags.
bson: no need to use variable for nofree flags.

Let the compiler setup the constant mask directly.

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