QTextStream: use new operator bool() around the code

- After adding the QTextStream::operator bool(), it is not required to
check the QTextStream::status(). It is enough to use the reference
of stream in the statement, which returns true if stream status is OK.
New operator usage makes code more convenient.

Task-number: QTBUG-52189
Change-Id: Id9ecaa8a5c9cf1931dbeefa85f9d948d15379a82
Reviewed-by: Marc Mutz <marc.mutz@qt.io>

src/gui/image/qxpmhandler.cpp

@@ -1137,7 +1137,7 @@ static bool write_xpm_image(const QImage &sourceImage, QIODevice *device, const
         s << '\"';
     }
     s << "};" << Qt::endl;
-    return (s.status() == QTextStream::Ok);
+    return static_cast<bool>(s);
 }
 
 QXpmHandler::QXpmHandler()

tests/manual/examples/widgets/draganddrop/fridgemagnets/dragwidget.cpp

@@ -21,9 +21,8 @@ DragWidget::DragWidget(QWidget *parent)
     int x = 5;
     int y = 5;
 
-    while (!inputStream.atEnd()) {
-        QString word;
-        inputStream >> word;
+    QString word;
+    while (inputStream >> word) {
         if (!word.isEmpty()) {
             DragLabel *wordLabel = new DragLabel(word, this);
             wordLabel->move(x, y);