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Replace the open coded equivalent with PTR_ERR_OR_ZERO(). Signed-off-by: zhong jiang <zhongjiang@huawei.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Link: https://lkml.kernel.org/r/1533053286-34990-1-git-send-email-zhongjiang@huawei.com