The earlier patch tried to be nice by just warning, but it seems
more likely that the user wants to adjust the parameters.
Also, it prevents a bundle containing _all_ revisions in the case
when the user only gave one ref, but also rev-list options which
excluded the ref.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <junkio@cox.net>