cat-file: restore warn_on_object_refname_ambiguity flag
Commit
25fba78 turned off the object/refname ambiguity check
during "git cat-file --batch" operations. However, this is a
global flag, so let's restore it when we are done.
This shouldn't make any practical difference, as cat-file
exits immediately afterwards, but is good code hygeine and
would prevent an unnecessary surprise if somebody starts to
call cmd_cat_file later.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>