submodule--helper: offer a consistent API
In 48308681 (2016-02-29, git submodule update: have a dedicated helper for cloning), the helper communicated errors back only via exit code, and dance with printing '#unmatched' in case of error was left to git-submodule.sh as it uses the output of the helper and pipes it into shell commands. This change makes the helper consistent by never printing '#unmatched' in the helper but always handling these piping issues in the actual shell script. Signed-off-by: NStefan Beller <sbeller@google.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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