Silence warning from unused variable in QObject test

It's not needed, but makes the point for having a mutable lambda in the
first place.

Change-Id: I483862d6aee90bb62d4b5363c56a80bb05e14df7
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/tests/auto/corelib/kernel/qobject/tst_qobject.cpp b/tests/auto/corelib/kernel/qobject/tst_qobject.cpp
index 5cb9faf01f..73b77932ce 100644
--- a/tests/auto/corelib/kernel/qobject/tst_qobject.cpp
+++ b/tests/auto/corelib/kernel/qobject/tst_qobject.cpp
@@ -8586,7 +8586,11 @@ void tst_QObject::asyncCallbackHelper()
         QCOMPARE(called, 1);
         QMetaObject::invokeMethod(this, [&called, u = std::unique_ptr<int>()]{ called = 2; });
         QCOMPARE(called, 2);
-        QMetaObject::invokeMethod(this, [&called, count = 0]() mutable { called = 3; });
+        QMetaObject::invokeMethod(this, [&called, count = 0]() mutable {
+            if (!count)
+                called = 3;
+            ++count;
+        });
         QCOMPARE(called, 3);
     }
 }