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The function can return negative values, so its result should be assigned to signed variable. Signed-off-by: Andrzej Hajda <a.hajda@samsung.com> Suggested-by: Krzysztof Kozlowski <k.kozlowski@samsung.com> Reviewed-by: Krzysztof Kozlowski <k.kozlowski@samsung.com> Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>