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If __ethtool_get_link_ksettings() is failed and with non-zero value, prb_calc_retire_blk_tmo() should return DEFAULT_PRB_RETIRE_TOV firstly. This patch is to refactory code and make it more readable. Signed-off-by: Mao Wenan <maowenan@huawei.com> Signed-off-by: David S. Miller <davem@davemloft.net>