[Bug 770925] New: qmlglsink: check qt_context_ first in GstQSGTexture::bind()

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=770925

            Bug ID: 770925
           Summary: qmlglsink: check qt_context_ first in
                    GstQSGTexture::bind()
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: jared.hu at nxp.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

When start qmlglsink app, it will set NULL buffer to GstQSGTexture when
updatePaintNode is not triggered by qt_item_set_buffer() at start. In which
case, qt_context_ will be a random value and cause gst_gl_context_activate()
fail or segment fault.

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