rtc: pm8xxx: return IRQ_NONE on errors

In the unlikely event that disabling the alarm and clearing the status
ever fails, return IRQ_NONE instead of IRQ_HANDLED.

Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Link: https://lore.kernel.org/r/20230202155448.6715-6-johan+linaro@kernel.org


Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>