net: phy: fix may not suspend when phy has WoL and not attached to ne…

[opsiff]

…tdev

move code to compat this case.

[deepin-ci-robot]

deepin pr auto review

关键摘要:

• 在mdio_bus_phy_may_suspend函数中，新增代码块没有考虑到phydev可能为空的情况，应该添加对phydev的空检查。
• phy_ethtool_get_wol函数的调用应该在if语句块中，以避免在phydev为空时执行该函数。
• phydev_warn函数调用时缺少注释说明，应该添加注释说明其用途。
• 新增代码中的注释应该遵循项目中的注释风格，例如使用多行注释或行内注释。

是否建议立即修改:
是

[deepin-ci-robot]

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