AutoTest: Fix condition for finish message

Slipped in with cc8bff67.

Change-Id: I02968395cf3ac5671326d874e5c58fef944225a9
Reviewed-by: David Schulz <david.schulz@qt.io>

src/plugins/autotest/qtest/qttestoutputreader.cpp

@@ -456,7 +456,7 @@ void QtTestOutputReader::sendFinishMessage(bool isFunction)
 {
     TestResultPtr testResult = TestResultPtr(createDefaultResult());
     testResult->setResult(Result::MessageTestCaseEnd);
-    if (m_duration.isEmpty()) {
+    if (!m_duration.isEmpty()) {
         testResult->setDescription(isFunction ? tr("Execution took %1 ms.").arg(m_duration)
                                               : tr("Test execution took %1 ms.").arg(m_duration));
     } else {