use xstrfmt to replace xmalloc + sprintf
This is one line shorter, and makes sure the length in the malloc and sprintf steps match. These conversions are very straightforward; we can drop the malloc entirely, and replace the sprintf with xstrfmt. Signed-off-by: NJeff King <peff@peff.net> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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