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The variable r is defined at the beginning and initialized to 0 until the function returns r, and the variable r is not reassigned.Therefore, we do not need to define the variable r, just return 0 directly at the end of the function. Signed-off-by: wengjianfeng <wengjianfeng@yulong.com> Signed-off-by: David S. Miller <davem@davemloft.net>