test: fix error path in testConnectOpen

In case of an error do the cleanup of the private data of the
connection.
Signed-off-by: NMarc Hartmayer <mhartmay@linux.vnet.ibm.com>
Reviewed-by: NBoris Fiuczynski <fiuczy@linux.vnet.ibm.com>
Reviewed-by: NJohn Ferlan <jferlan@redhat.com>

src/test/test_driver.c

@@ -1483,8 +1483,11 @@ testConnectOpen(virConnectPtr conn,
         return ret;
 
     /* Fake authentication. */
-    if (testConnectAuthenticate(conn, auth) < 0)
+    if (testConnectAuthenticate(conn, auth) < 0) {
+        testDriverCloseInternal(conn->privateData);
+        conn->privateData = NULL;
         return VIR_DRV_OPEN_ERROR;
+    }
 
     return VIR_DRV_OPEN_SUCCESS;
 }