Mark QFileDevice security significant

qfiledevice.cpp contains some minimal data inspection, see
putCharHelper(). However, this is very simple and not sufficient to make
the file critical.

QUIP: 23
Task-number: QTBUG-135187
Change-Id: I76e608fa42b0bca003fc5d0166fd863583df075a
Reviewed-by: Ivan Solovev <ivan.solovev@qt.io>
(cherry picked from commit 2eb3d79a578e13b686875fdce26b397a796d162f)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
(cherry picked from commit d2d682e91473fd6cbe74fb29f2ae522342485bf5)
(cherry picked from commit 42dc822727a9ef25787c2db6a6a7167f50139754)

src/corelib/io/qfiledevice.cpp

@@ -1,5 +1,6 @@
 // Copyright (C) 2016 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
+// Qt-Security score:significant reason:trivial-parsing-only
 
 #include "qplatformdefs.h"
 #include "qfiledevice.h"

src/corelib/io/qfiledevice.h

@@ -1,5 +1,6 @@
 // Copyright (C) 2020 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
+// Qt-Security score:significant reason:default
 
 #ifndef QFILEDEVICE_H
 #define QFILEDEVICE_H

src/corelib/io/qfiledevice_p.h

@@ -1,5 +1,6 @@
 // Copyright (C) 2022 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
+// Qt-Security score:significant reason:default
 
 #ifndef QFILEDEVICE_P_H
 #define QFILEDEVICE_P_H