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dns-domain: fix the RFC reference
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@ -206,7 +206,7 @@ int dns_label_escape(const char *p, size_t l, char *dest, size_t sz) {
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char *q;
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/* DNS labels must be between 1 and 63 characters long. A
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* zero-length label does not exist. See RFC 2182, Section
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* zero-length label does not exist. See RFC 2181, Section
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* 11. */
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if (l <= 0 || l > DNS_LABEL_MAX)
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