net: phy: Use IS_ERR() to check and simplify code
Use IS_ERR() and PTR_ERR() instead of PTR_ZRR_OR_ZERO() to simplify code, avoid redundant paramenter definitions and judgements. Signed-off-by: Zhang Shengju <zhangshengju@cmss.chinamobile.com> Signed-off-by: Tang Bin <tangbin@cmss.chinamobile.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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