Fix clang -Wsign-conversion warning in grisu_count_digits. (#1573)
grisu_count_digits is only used by grisu_gen_digits, which assigns the unsigned result to a (signed) int. Although grisu_count_digits always returns a positive integer this keeps its return type in sync with the type its result is assigned to.
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@ -756,7 +756,7 @@ enum result {
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}
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// A version of count_digits optimized for grisu_gen_digits.
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inline unsigned grisu_count_digits(uint32_t n) {
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inline int grisu_count_digits(uint32_t n) {
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if (n < 10) return 1;
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if (n < 100) return 2;
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if (n < 1000) return 3;
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