parameters of g_signal_emit_by_name

[joël krähemann <joel weedlight ch>]

										Hi
I'm asking me whether g_signal_emit_by_name with a
g_cclosure_marshal_VOID__VOID has a need for a trailing NULL as
parameter. I saw in
http://library.gnome.org/devel/gtk-tutorial/2.13/x745.html that there's
no need for it, but in a project called oregano I saw that there was
NULL as last parameter with the same marshaller.