net: ethoc: constify of_device_id array

of_device_id is always used as const.
(See driver.of_match_table and open firmware functions)

Signed-off-by: Fabian Frederick <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/ethernet/ethoc.c

···
 # define ethoc_resume  NULL
 #endif
 
-static struct of_device_id ethoc_match[] = {
+static const struct of_device_id ethoc_match[] = {
 	{ .compatible = "opencores,ethoc", },
 	{},
 };