uboot-imx

net: cancel timeout handler after DHCPACK

Timeout handler should be stopped after reception of DHCPACK. If "autoload"
is not set, the handler is immediately replaced by the TFTP handler,
otherwise it may trigger before the next boot stage begins.

Signed-off-by: Stefan Brüns <stefan.bruens@rwth-aachen.de>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>