[PATCH 1/2] rtc: rtc-ds1374: fix 'no irq' case handling

[Alan Cox]

> I don't know the status of these platforms....
> 
> asm-blackfin/irq.h:#define NO_IRQ ((unsigned int)(-1))
> asm-mn10300/irq.h:#define NO_IRQ		INT_MAX
> asm-parisc/irq.h:#define NO_IRQ		(-1)

In need of fixing, assuming they actually use NO_IRQ for anything - don't
be mislead by the fact they may have old defines lying around.

Alan