clone: detect extra arguments
If git clone is given more than two non-option arguments, it silently throws away all but the first one. Complain instead. Discovered by comparing the new builtin clone to the old git-clone.sh. Signed-off-by: NJonathan Nieder <jrnieder@gmail.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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