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IRQ numbers are always positive, hence the corresponding variable should be unsigned to keep types consistent. This is a minor change that cleans up code a tad more. Suggested-by: Thierry Reding <thierry.reding@gmail.com> Acked-by: MyungJoo Ham <myungjoo.ham@samsung.com> Reviewed-by: Chanwoo Choi <cw00.choi@samsung.com> Tested-by: Peter Geis <pgwipeout@gmail.com> Signed-off-by: Dmitry Osipenko <digetx@gmail.com> Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>