Re: [PATCH] builtin-commit: fix --signoff

>  	if (signoff) {
> ...
> +		strbuf_init(&sob, 0);
> +		strbuf_addstr(&sob, sign_off_header);
> +		strbuf_addstr(&sob, git_committer_info(1));
> +		p = strrchr(sob.buf, '>');
> +		if (p)
> +			strbuf_setlen(&sob, p + 1 - sob.buf);
> +		strbuf_addch(&sob, '\n');
> +
> +		for (i = sb.len - 1; i > 0 && sb.buf[i - 1] != '\n'; i--)
> +			; /* do nothing */
> +		if (prefixcmp(sb.buf + i, sob.buf))
> +			strbuf_addbuf(&sb, &sob);
>  	}