powerpc: eeh: Fixup the brown paperbag fallout of the "cleanup"

Commit b8a9a11b (powerpc: eeh: Kill another abuse of irq_desc) is
missing some brackets .....

It's not a good idea to write patches in grumpy mode and then forget
to at least compile test them or rely on the few eyeballs discussing
that patch to spot it.....

Reported-by: fengguang.wu@intel.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Gavin Shan <shangw@linux.vnet.ibm.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: ppc <linuxppc-dev@lists.ozlabs.org>

arch/powerpc/kernel/eeh_driver.c

@@ -166,8 +166,9 @@ static void eeh_enable_irq(struct pci_dev *dev)
 		 *
 		 *	tglx
 		 */
-		if (irqd_irq_disabled(irq_get_irq_data(dev->irq))
+		if (irqd_irq_disabled(irq_get_irq_data(dev->irq)))
 			enable_irq(dev->irq);
+	}
 }
 
 /**