libutil: Fix infinite loop in filterANSIEscapes on '\r'
E.g. nix-instantiate --eval -E 'abort "\r"' hangs. Found by afl-fuzz.
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@ -1216,7 +1216,7 @@ std::string filterANSIEscapes(const std::string & s, unsigned int width)
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else if (*i == '\r')
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// do nothing for now
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;
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i++;
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else {
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t += *i++; w++;
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