The last change to drivers/wan/hd6457x.c was a bit fatal to drivers
using it - the attached patch fixes NULL pointer dereference on RX.

I've updated URLs in MAINTAINERS and wan/Kconfig as well.
Signed-off-by: Krzysztof Halasa <khc@pm.waw.pl>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>