drivers/net/wireless/rtl818x: 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/rtl818x/rtl8180_dev.c

@@ -548,7 +548,7 @@ static int rtl8180_start(struct ieee80211_hw *dev)
 	rtl818x_iowrite32(priv, &priv->map->TNPDA, priv->tx_ring[1].dma);
 	rtl818x_iowrite32(priv, &priv->map->TLPDA, priv->tx_ring[0].dma);
 
-	ret = request_irq(priv->pdev->irq, &rtl8180_interrupt,
+	ret = request_irq(priv->pdev->irq, rtl8180_interrupt,
 			  IRQF_SHARED, KBUILD_MODNAME, dev);
 	if (ret) {
 		printk(KERN_ERR "%s: failed to register IRQ handler\n",