cassini driver: Use of uninitialized memory

Hello,

the interrupt routine of the cassini driver
currently looks like this:

----------------------
static irqreturn_t cas_interruptN(int irq, void *dev_id)
{
	struct net_device *dev = dev_id;
	struct cas *cp = netdev_priv(dev);
	unsigned long flags;
	int ring;
	u32 status = readl(cp->regs + REG_PLUS_INTRN_STATUS(ring));
...
----------------------

-> "ring" isn't initialized properly and gets used
in REG_PLUS_INTRN_STATUS. Some lines below there's this:

----------------------
	ring = (irq == cp->pci_irq_INTC) ? 2 : 3;
----------------------

Should that line be moved before the readl() call
or should "ring" be initialized with zero?

Credit for spotting this goes to cppcheck.

Cheers,
Thomas