enetc: simplify the return expression of enetc_vf_set_mac_addr()

[ Upstream commit d4b717dd ]

Simplify the return expression.

Signed-off-by: Qinglang Miao <miaoqinglang@huawei.com>
Reviewed-by: Claudiu Manoil <claudiu.manoil@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Stable-dep-of: badccd49 ("net: enetc: set MAC address to the VF net_device")
Signed-off-by: Sasha Levin <sashal@kernel.org>