qt, refactor: Limit scope of QPainter object

Author: hebasto

src/qt/qrimagewidget.cpp

@@ -66,6 +66,7 @@ bool QRImageWidget::setQR(const QString& data, const QString& text)
 
     QImage qrAddrImage = QImage(QR_IMAGE_SIZE, QR_IMAGE_SIZE + (text.isEmpty() ? 0 : 20), QImage::Format_RGB32);
     qrAddrImage.fill(0xffffff);
+    {
         QPainter painter(&qrAddrImage);
         painter.drawImage(0, 0, qrImage.scaled(QR_IMAGE_SIZE, QR_IMAGE_SIZE));
 
@@ -82,8 +83,8 @@ bool QRImageWidget::setQR(const QString& data, const QString& text)
             paddedRect.setHeight(QR_IMAGE_SIZE+12);
             painter.drawText(paddedRect, Qt::AlignBottom|Qt::AlignCenter, text);
         }
+    }
 
-    painter.end();
     setPixmap(QPixmap::fromImage(qrAddrImage));
 
     return true;