重新定义* _get_type（void）gtk + requried方法

error: redefinition of 'tinygecko_notebook_get_type'
note: previous definition of 'tinygecko_notebook_get_type' was here

GType
tinygecko_notebook_get_type (void)
{
    static GType type = 0;
    if (type == 0) {
        static const GTypeInfo info = {
            sizeof (TinygeckoNotebookClass), /* size of class struct */
            NULL,   /* base_init */
            NULL,   /* base_finalize */
            (GClassInitFunc)tinygecko_notebook_class_init,   /* class_init */
            NULL,   /* class_finalize */
            NULL,   /* class_data */
            sizeof (TinygeckoNotebook),
            0,      /* n_preallocs */
            (GInstanceInitFunc)tinygecko_notebook_init   /* instance_init */
        };

        type = g_type_register_static (GTK_TYPE_NOTEBOOK, "TinygeckoNotebook", &info, 0);

    }
    return type;
}

G_DEFINE_TYPE (TinygeckoNotebook, tinygecko_notebook, GTK_TYPE_NOTEBOOK);