Curl_wait_for_resolv() no longer disconnects on failure, but leaves that

operation to the caller. Disconnecting has the disadvantage that the conn
pointer gets completely invalidated and this is not handled on lots of places
in the code.

lib/transfer.c

@@ -2038,6 +2038,8 @@ Curl_connect_host(struct SessionHandle *data,
       if(CURLE_OK == res)
         /* Resolved, continue with the connection */
         res = Curl_async_resolved(*conn);
+      else
+        (void)Curl_disconnect(*conn);
     }
     if(res)
       break;