bash completion: remove unused function _git_diff_tree
completion for git diff-tree was removed in 5cfb4fe5Signed-off-by: NLee Marlow <lee.marlow@gmail.com> Acked-by: NShawn O. Pearce <spearce@spearce.org> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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