compat/hstrerror: convert sprintf to snprintf
This is a trivially correct use of sprintf, as our error number should not be excessively long. But it's still nice to drop an sprintf call. Note that we cannot use xsnprintf here, because this is compat code which does not load git-compat-util.h. Signed-off-by: NJeff King <peff@peff.net> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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