upload-archive: convert sprintf to strbuf
When we report an error to the client, we format it into a fixed-size buffer using vsprintf(). This can't actually overflow in practice, since we only format a very tame subset of strings (mostly strerror() output). However, it's hard to tell immediately, so let's just use a strbuf so readers do not have to wonder. We do add an allocation here, but the performance is not important; the next step is to call die() anyway. Signed-off-by: NJeff King <peff@peff.net> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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