net: ethernet: mvneta: Fix error handling in mvneta_probe

net: ethernet: mvneta: Fix error handling in mvneta_probe

[ Upstream commit 58f60329a6be35a5653edb3fd2023ccef9eb9943 ]

When mvneta_port_power_up() fails, we should execute
cleanup functions after label err_netdev to avoid memleak.

Fixes: 41c2b6b4f0f80 ("net: ethernet: mvneta: Add back interface mode validation")
Signed-off-by: Dinghao Liu <dinghao.liu@zju.edu.cn>
Link: https://lore.kernel.org/r/20201220082930.21623-1-dinghao.liu@zju.edu.cn
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>