fix for lib539.c ?

539.patch

diff --git a/tests/libtest/lib539.c b/tests/libtest/lib539.c
index 0e8aada4b..75f146c00 100644
--- a/tests/libtest/lib539.c
+++ b/tests/libtest/lib539.c
@@ -68,11 +68,11 @@ int test(char *URL)
      return TEST_ERR_MAJOR_BAD;
    }
 
    slist = curl_slist_append(NULL, "SYST");
    if(!slist) {
-     free(newURL);
+     curl_free(newURL);
      curl_easy_cleanup(curl);
      curl_global_cleanup();
      return TEST_ERR_MAJOR_BAD;
    }
 
@@ -83,11 +83,11 @@ int test(char *URL)
    res = curl_easy_perform(curl);
 
 test_cleanup:
 
    curl_slist_free_all(slist);
-   free(newURL);
+   curl_free(newURL);
    curl_easy_cleanup(curl);
    curl_global_cleanup();
 
    return (int)res;
 }