Check if down_button is NULL. This happens when the pathbar button for the

Check if down_button is NULL. This happens when the pathbar button for the

2007-06-04  Cody Russell  <bratsche@gnome.org>

        * gtk/gtkpathbar.c (gtk_path_bar_scroll_down): Check
        if down_button is NULL.  This happens when the pathbar button
        for the current directory is too large to fit in the
        space, e.g. on Windows for directories named something like
        "My Documents and Settings".

svn path=/trunk/; revision=18030