don't cast a possible NULL pointer.

don't cast a possible NULL pointer.

Wed Jan  9 11:23:39 2002  Tim Janik  <timj@gtk.org>

        * gtk/gtklayout.c (gtk_layout_get_property):
        * gtk/gtkspinbutton.c (gtk_spin_button_get_property):
        * gtk/gtktreeview.c (gtk_tree_view_get_property):
        * gtk/gtkwidget.c (gtk_widget_get_property):
        * gtk/gtkfontsel.c (gtk_font_selection_get_property):
        * gtk/gtkrange.c (gtk_range_get_property):
        * gtk/gtkviewport.c (gtk_viewport_get_property):
        * gtk/gtkprogressbar.c (gtk_progress_bar_get_property): don't cast a
        possible NULL pointer.