hvc_console: Call free_irq() only if request_irq() was successful

Only call free_irq if we marked the request_irq has having succeeded
instead of whenever the the sub-driver identified the interrupt to use.
Signed-off-by: Milton Miller <miltonm@bga.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

drivers/char/hvc_irq.c

@@ -37,7 +37,7 @@ int notifier_add_irq(struct hvc_struct *hp, int irq)
 
 void notifier_del_irq(struct hvc_struct *hp, int irq)
 {
-	if (!irq)
+	if (!hp->irq_requested)
 		return;
 	free_irq(irq, hp);
 	hp->irq_requested = 0;