parisc: Ratelimit dino stuck interrupt warnings

While playing with qemu with an emulated RT8139cp NIC, I faced lots of
the following warnings:
Dino 0x00810000: stuck interrupt 2

This patch ratelimits this warning and reports back that the IRQ was
handled.
Signed-off-by: Helge Deller <deller@gmx.de>

drivers/parisc/dino.c

@@ -396,9 +396,8 @@ static irqreturn_t dino_isr(int irq, void *intr_dev)
 	if (mask) {
 		if (--ilr_loop > 0)
 			goto ilr_again;
-		printk(KERN_ERR "Dino 0x%px: stuck interrupt %d\n",
+		pr_warn_ratelimited("Dino 0x%px: stuck interrupt %d\n",
 		       dino_dev->hba.base_addr, mask);
-		return IRQ_NONE;
 	}
 	return IRQ_HANDLED;
 }