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match_string() returns the array index of a matching string. Use it instead of the open-coded implementation. Signed-off-by: YueHaibing <yuehaibing@huawei.com> Link: https://lkml.kernel.org/r/20191109034226.21044-1-yuehaibing@huawei.com Signed-off-by: Stephen Boyd <sboyd@kernel.org>