mailinfo: don't decode invalid =XY quoted-printable sequences
Decode =XY in quoted-printable segments only if X and Y are hexadecimal digits, otherwise just copy them. That's at least better than interpreting negative results from hexval() as a character. Reported-by: NJeff King <peff@peff.net> Signed-off-by: NRene Scharfe <l.s.r@web.de> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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