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The function can return negative values, so its result should be assigned to signed variable. The problem has been detected using proposed semantic patch scripts/coccinelle/tests/assign_signed_to_unsigned.cocci [1]. [1]: http://permalink.gmane.org/gmane.linux.kernel/2046107 Signed-off-by: Andrzej Hajda <[email protected]> Reviewed-by: Krzysztof Kozlowski <[email protected]> Signed-off-by: Chanwoo Choi <[email protected]>