url: fix CURLOPT_DNS_CACHE_TIMEOUT arg value check to allow -1

Prior to this change since f121575 (7.56.1+) CURLOPT_DNS_CACHE_TIMEOUT erroneously rejected -1 with CURLE_BAD_FUNCTION_ARGUMENT.
2017-11-02 00:30:28 -04:00 · 2017-11-02 00:30:28 -04:00 · b51e0742b9
parent 544bfdebea
commit b51e0742b9
1 changed files with 1 additions and 1 deletions
--- a/lib/url.c
+++ b/lib/url.c
@ -722,7 +722,7 @@ CURLcode Curl_setopt(struct Curl_easy *data, CURLoption option,
  switch(option) {
  case CURLOPT_DNS_CACHE_TIMEOUT:
    arg = va_arg(param, long);
-    if(arg < 0)
+    if(arg < -1)
      return CURLE_BAD_FUNCTION_ARGUMENT;
    data->set.dns_cache_timeout = arg;
    break;