[PATCH] dgrs: fix warnings when CONFIG_ISA and CONFIG_PCI are not enabled

This patch fixes compiler warnings when CONFIG_ISA and CONFIG_PCI are not
enabled in the dgrc network driver.

Signed-off-by: Ashutosh Naik <ashutosh.naik@gmail.com>
Cc: Jeff Garzik <jgarzik@pobox.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>