strbuf: make strbuf_complete_line more generic
The strbuf_complete_line function makes sure that a buffer ends in a newline. But we may want to do this for any character (e.g., "/" on the end of a path). Let's factor out a generic version, and keep strbuf_complete_line as a thin wrapper. Signed-off-by: NJeff King <peff@peff.net> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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