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urlapi: fix unused variable warning
`dest` is only used with `ENABLE_IPV6`. Closes https://github.com/curl/curl/pull/4444
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@ -596,7 +596,9 @@ static CURLUcode hostname_check(struct Curl_URL *u, char *hostname)
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size_t hlen = strlen(hostname);
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if(hostname[0] == '[') {
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#ifdef ENABLE_IPV6
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char dest[16]; /* fits a binary IPv6 address */
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#endif
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const char *l = "0123456789abcdefABCDEF:.";
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if(hlen < 5) /* '[::1]' is the shortest possible valid string */
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return CURLUE_MALFORMED_INPUT;
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