gtk: Fix possibility of NULL variable
It's quite unlikely since it's initialized in instance initialization. CID #1417721
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@ -496,6 +496,7 @@ gtk_gst_gl_widget_init_winsys (GtkGstGLWidget * gst_widget)
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GError *error = NULL;
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g_return_val_if_fail (GTK_IS_GST_GL_WIDGET (gst_widget), FALSE);
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g_return_val_if_fail (priv->display != NULL, FALSE);
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GTK_GST_BASE_WIDGET_LOCK (gst_widget);
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