drivers/net/wireless/p54: remove exceptional & on function name

In this file, function names are otherwise used as pointers without &.

A simplified version of the semantic patch that makes this change is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
@r@
identifier f;
@@

f(...) { ... }

@@
identifier r.f;
@@

- &f
+ f
// </smpl>
Signed-off-by: NJulia Lawall <julia@diku.dk>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/wireless/p54/p54pci.c

@@ -411,7 +411,7 @@ static int p54p_open(struct ieee80211_hw *dev)
 	int err;
 
 	init_completion(&priv->boot_comp);
-	err = request_irq(priv->pdev->irq, &p54p_interrupt,
+	err = request_irq(priv->pdev->irq, p54p_interrupt,
 			  IRQF_SHARED, "p54pci", dev);
 	if (err) {
 		dev_err(&priv->pdev->dev, "failed to register IRQ handler\n");