iio: adc: vf610: Propagate the real error when platform_get_irq() fails
There is no need to pass a 'fake' return value when platform_get_irq() fails. Propagate the real error instead. While at it, only consider negative numbers returned by platform_get_irq() as error. Signed-off-by: NFabio Estevam <fabio.estevam@freescale.com> Signed-off-by: NJonathan Cameron <jic23@kernel.org>
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