trailer: display a trailer without its trailing newline
Trailers passed to the parse_trailer() function often have a trailing newline. When erroring out, we should display the invalid trailer properly, that means without any trailing newline. Helped-by: NJunio C Hamano <gitster@pobox.com> Helped-by: NJeff King <peff@peff.net> Signed-off-by: NChristian Couder <chriscool@tuxfamily.org> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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