[media] media: rc: nuvoton: replace usage of spin_lock_irqsave in ISR

Kernel takes care that interrupts from one source are serialized.
So there's no need to use spinlock_irq_save.

Signed-off-by: Heiner Kallweit <[e-mail]>
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

drivers/media/rc/nuvoton-cir.c

···
 {
 	struct nvt_dev *nvt = data;
 	u8 status, iren;
-	unsigned long flags;
 
 	nvt_dbg_verbose("%s firing", __func__);
 
-	spin_lock_irqsave(&nvt->lock, flags);
+	spin_lock(&nvt->lock);
 
 	/*
 	 * Get IR Status register contents. Write 1 to ack/clear
···
 	 * logical device is being disabled.
 	 */
 	if (status == 0xff && iren == 0xff) {
-		spin_unlock_irqrestore(&nvt->lock, flags);
+		spin_unlock(&nvt->lock);
 		nvt_dbg_verbose("Spurious interrupt detected");
 		return IRQ_HANDLED;
 	}
···
 	 * status bit whether the related interrupt source is enabled
 	 */
 	if (!(status & iren)) {
-		spin_unlock_irqrestore(&nvt->lock, flags);
+		spin_unlock(&nvt->lock);
 		nvt_dbg_verbose("%s exiting, IRSTS 0x0", __func__);
 		return IRQ_NONE;
 	}
···
 		}
 	}
 
-	spin_unlock_irqrestore(&nvt->lock, flags);
+	spin_unlock(&nvt->lock);
 
 	nvt_dbg_verbose("%s done", __func__);
 	return IRQ_HANDLED;