reader: return NULL instead of FALSE.
reader: return NULL instead of FALSE.

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