This was an oversight in 55856a35b2 (rm: absorb a submodules git dir
before deletion, 2016-12-27), as the body of the test changed without
adapting the test subject.
Signed-off-by: Stefan Beller <sbeller@google.com> Reviewed-by: Jonathan Nieder <jrnieder@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>