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Issue highlighted by smatch warning: CHECK drivers/iio/adc/vf610_adc.c drivers/iio/adc/vf610_adc.c:466 vf610_read_raw() warn: unsigned 'ret' is never less than zero. As wait_for_completion_interruptible_timeout can return -ERESTARTSTSYS, if interrupted, ret must be signed. Signed-off-by: Jonathan Cameron <jic23@kernel.org> Acked-by: Fugang Duan <B38611@freescale.com>