NFC: Move the pn544_hci dereference below the NULL test

The dereference should be moved below the NULL test.

spatch with a semantic match is used to found this.
(http://coccinelle.lip6.fr/)

Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

drivers/nfc/pn544_hci.c

@@ -346,13 +346,16 @@ flush:
 static irqreturn_t pn544_hci_irq_thread_fn(int irq, void *dev_id)
 {
 	struct pn544_hci_info *info = dev_id;
-	struct i2c_client *client = info->i2c_dev;
+	struct i2c_client *client;
 	struct sk_buff *skb = NULL;
 	int r;
 
-	BUG_ON(!info);
-	BUG_ON(irq != info->i2c_dev->irq);
+	if (!info || irq != info->i2c_dev->irq) {
+		WARN_ON_ONCE(1);
+		return IRQ_NONE;
+	}
 
+	client = info->i2c_dev;
 	dev_dbg(&client->dev, "IRQ\n");
 
 	if (info->hard_fault != 0)