Test whether type is not equal to GTK_TOOLBAR_CHILD_RADIOBUTTON before

Test whether type is not equal to GTK_TOOLBAR_CHILD_RADIOBUTTON before

1998-09-16  Federico Mena Quintero  <federico@nuclecu.unam.mx>

	* gtk/gtktoolbar.c (gtk_toolbar_insert_element): Test whether type
	is not equal to GTK_TOOLBAR_CHILD_RADIOBUTTON before checking that
	(widget != NULL), otherwise radio button insertion will not work
	-- the widget argument is NULL for the first radio button in the
	group.