This patch fixes a null pointer access in r6040_rx due
to lp->dev not being initialized.

Fix the TX timeouts, TX irq was not re-enabled on RX irq
Signed-Off-By: NJoerg Albert <jal2@gmx.de>
Signed-off-by: NFlorian Fainelli <florian.fainelli@telecomint.eu>
Signed-off-by: NJeff Garzik <jgarzik@redhat.com>