strbuf: make sure buffer is zero-terminated
strbuf_init does not zero-terminate the initial buffer when hint is non-zero. Fix this so we can rely on the string to be zero-terminated even if we haven't filled it with anything yet. Signed-off-by: NErik Faye-Lund <kusmabite@gmail.com> Acked-by: NJeff King <peff@peff.net> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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