net: propagate dev_get_valid_name return code
if dev_get_valid_name failed, propagate its return code and remove the setting err to ENODEV, it will be set to 0 again before dev_change_net_namespace exits. Signed-off-by: NLi RongQing <lirongqing@baidu.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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