2008-10-08  Christian Dywan  <christian@imendio.com>

Bug 555270 – Allow unsetting a MessageDialog's image

* gtk/gtkmessagedialog.c (gtk_message_dialog_set_property),
Remove a superfluous cast to GtkWidget*
(gtk_message_dialog_set_image): Accept NULL for the image
and unset the image in that case.

svn path=/trunk/; revision=21607