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qt: fix segmentation fault in QtGLVideoItem::onSceneGraphInitialized

Vincas Dargis requested to merge Talkless/gstreamer:Talkless-main-patch-02178 into main

QtGLVideoItem::onSceneGraphInitialized can be invoked by runable in Qt render thread just after (during?) destruction of QtGLVideoItem. Once this->priv is set to NULL, segmentation fault occurs during access to this->priv->qt_context or even in GST_DEBUG() call if qt*:5 is enabled.

Check if this->priv is NULL and short-circuit out of QtGLVideoItem::onSceneGraphInitialized to avoid crash.

Closes #2421

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