upload-pack: Improve error message when bad ref requested
When printing an error message saying a ref was requested that we do not have, only print that ref, rather than the ref and everything sent to us on the same packet line (e.g. protocol support specifications). Signed-off-by: NElijah Newren <newren@gmail.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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