g_return_val_if_fail for *preconditions*; they are not guaranteed to
compile to code if the user disables debugging.  So don't use them as
a shortcut for checking error conditions in the body of your
function.

1999-06-02  Nat Friedman  <nat@gnome-support.com>

        * applet-widget.c (pg_return_val_if_fail): Do not use glib
        g_return_val_if_fail, since that will compile to a NOP with
        debugging turned off.

        (pg_return_if_fail): Do not use g_return_if_fail.