rtlwifi: Fix incorrect return of IRQ_HANDLED

The recent discussion regarding an incorrect return of IRQ_HANDLED
from rt2800pci caused me to look at this PCI interrupt routine. I
discovered that changes were needed.
Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/rtlwifi/pci.c

@@ -780,6 +780,7 @@ static irqreturn_t _rtl_pci_interrupt(int irq, void *dev_id)
 	unsigned long flags;
 	u32 inta = 0;
 	u32 intb = 0;
+	irqreturn_t ret = IRQ_HANDLED;
 
 	spin_lock_irqsave(&rtlpriv->locks.irq_th_lock, flags);
 
@@ -787,8 +788,10 @@ static irqreturn_t _rtl_pci_interrupt(int irq, void *dev_id)
 	rtlpriv->cfg->ops->interrupt_recognized(hw, &inta, &intb);
 
 	/*Shared IRQ or HW disappared */
-	if (!inta || inta == 0xffff)
+	if (!inta || inta == 0xffff) {
+		ret = IRQ_NONE;
 		goto done;
+	}
 
 	/*<1> beacon related */
 	if (inta & rtlpriv->cfg->maps[RTL_IMR_TBDOK]) {
@@ -892,7 +895,7 @@ static irqreturn_t _rtl_pci_interrupt(int irq, void *dev_id)
 
 done:
 	spin_unlock_irqrestore(&rtlpriv->locks.irq_th_lock, flags);
-	return IRQ_HANDLED;
+	return ret;
 }
 
 static void _rtl_pci_irq_tasklet(struct ieee80211_hw *hw)