The variables $branch and $orig_head were used as synonyms. To avoid
confusion, remove $branch. The name 'orig_head' seems more suitable,
since that is the name used when the variable is persisted.
Signed-off-by: Martin von Zweigbergk <martin.von.zweigbergk@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>