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As opposed to open-code, using the ERR_CAST macro clearly indicates that this is a pointer to an error value and a type conversion was performed. Link: https://patch.msgid.link/r/202504012109233981_YPVbd4wQzmAzP3tA5IG@zte.com.cn Signed-off-by: Li Haoran <li.haoran7@zte.com.cn> Signed-off-by: Shao Mingyin <shao.mingyin@zte.com.cn> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>