SpinBox: fix JS callback access

Avoid calling an uninitialized JS callback. This is a regression caused
by lazy creation of the JS callbacks in 1f146d9.

Change-Id: I1816b491ada0509c5664cffbcaa32ca987095b31
Task-number: QTBUG-51114
Reviewed-by: Mitch Curtis <mitch.curtis@theqtcompany.com>
Reviewed-by: Liang Qi <liang.qi@theqtcompany.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/templates/qquickspinbox.cpp b/src/templates/qquickspinbox.cpp
index bda955d0..255715e1 100644
--- a/src/templates/qquickspinbox.cpp
+++ b/src/templates/qquickspinbox.cpp
@@ -133,7 +133,7 @@ void QQuickSpinBoxPrivate::updateValue()
         if (text.isValid()) {
             QV4::ExecutionEngine *v4 = QQmlEnginePrivate::getV4Engine(qmlEngine(q));
             QJSValue loc(v4, QQmlLocale::wrap(v4, locale));
-            QJSValue val = valueFromText.call(QJSValueList() << text.toString() << loc);
+            QJSValue val = q->valueFromText().call(QJSValueList() << text.toString() << loc);
             q->setValue(val.toInt());
         }
     }