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git-commit would silently exit if duplicate Signed-off-by lines were found. Users of git-commit would not know it, unless they checked '$?'. This patch makes git-commit actually print out a message that nothing was commited since duplicate Signed-off-lines were found. Signed-off-by: Luben Tuikov <ltuikov@yahoo.com> Signed-off-by: Junio C Hamano <junkio@cox.net>