octeon: constify netdev->dev_addr

Argument of a helper is missing a const.
Reported-by: Nkernel test robot <lkp@intel.com>
Fixes: adeef3e3 ("net: constify netdev->dev_addr")
Signed-off-by: NJakub Kicinski <kuba@kernel.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/cavium/octeon/octeon_mgmt.c

@@ -548,7 +548,7 @@ struct octeon_mgmt_cam_state {
 };
 
 static void octeon_mgmt_cam_state_add(struct octeon_mgmt_cam_state *cs,
-				      unsigned char *addr)
+				      const unsigned char *addr)
 {
 	int i;