mlx4: replace mlx4_u64_to_mac() with u64_to_ether_addr()

mlx4_u64_to_mac() predates the common helper but doesn't
make the argument constant.
Signed-off-by: NJakub Kicinski <kuba@kernel.org>
Reviewed-by: NTariq Toukan <tariqt@nvidia.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/mellanox/mlx4/cmd.c

@@ -3195,7 +3195,7 @@ int mlx4_set_vf_spoofchk(struct mlx4_dev *dev, int port, int vf, bool setting)
 	port = mlx4_slaves_closest_port(dev, slave, port);
 	s_info = &priv->mfunc.master.vf_admin[slave].vport[port];
 
-	mlx4_u64_to_mac(mac, s_info->mac);
+	u64_to_ether_addr(s_info->mac, mac);
 	if (setting && !is_valid_ether_addr(mac)) {
 		mlx4_info(dev, "Illegal MAC with spoofchk\n");
 		return -EPERM;

include/linux/mlx4/driver.h

@@ -92,14 +92,4 @@ void *mlx4_get_protocol_dev(struct mlx4_dev *dev, enum mlx4_protocol proto, int
 
 struct devlink_port *mlx4_get_devlink_port(struct mlx4_dev *dev, int port);
 
-static inline void mlx4_u64_to_mac(u8 *addr, u64 mac)
-{
-	int i;
-
-	for (i = ETH_ALEN; i > 0; i--) {
-		addr[i - 1] = mac & 0xFF;
-		mac >>= 8;
-	}
-}
-
 #endif /* MLX4_DRIVER_H */