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/hostares.c

@@ -249,7 +249,7 @@ CURLcode Curl_wait_for_resolv(struct connectdata *conn,
 
     /* close the connection, since we can't return failure here without
        cleaning up this connection properly */
-    Curl_disconnect(conn);
+    conn->bits.close = TRUE;
   }
 
   return rc;

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;