Fix validation of overly-long IPv6 addresses.
The inet/cidr types sometimes failed to reject IPv6 inputs with too many colon-separated fields, instead translating them to '::/0'. This is the result of a thinko in the original ISC code that seems to be as yet unreported elsewhere. Per bug #14198 from Stefan Kaltenbrunner. Report: <20160616182222.5798.959@wrigleys.postgresql.org>
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@ -496,7 +496,7 @@ inet_cidr_pton_ipv6(const char *src, u_char *dst, size_t size)
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else if (*src == '\0')
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goto enoent;
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if (tp + NS_INT16SZ > endp)
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return (0);
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goto enoent;
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*tp++ = (u_char) (val >> 8) & 0xff;
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*tp++ = (u_char) val & 0xff;
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saw_xdigit = 0;
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