isdn: hisax: Replace the bogus access to irq stats
Abusing irq stats in a driver for counting interrupts is a horrible idea and not safe with shared interrupts. Replace it by a local interrupt counter. Noticed by the attempt to remove the irq stats export. Signed-off-by: NThomas Gleixner <tglx@linutronix.de> Reviewed-by: NIngo Molnar <mingo@elte.hu>
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