Fix a potential NULL pointer dereference in mace_interrupt() in drivers/net/pcmcia/nmclan_cs.c

This patch fixes a potential null dereference bug where we dereference
DEV before a null check. This patch simply moves the dereferencing after
the null check.

Signed-off-by: Micah Gruber <micah.gruber@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>