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