rtc: at91rm9200: double locking bug in at91_rtc_interrupt()

There is a typo here so we deadlock.

Fixes: dd1f1f39 ('rtc: at91rm9200: rework wakeup and interrupt handling')
Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com>
Acked-by: NBoris Brezillon <boris.brezillon@free-electrons.com>
Reported-by: NDavid Dueck <davidcdueck@googlemail.com>
Signed-off-by: NNicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/rtc/rtc-at91rm9200.c

@@ -324,7 +324,7 @@ static irqreturn_t at91_rtc_interrupt(int irq, void *dev_id)
 
 		ret = IRQ_HANDLED;
 	}
-	spin_lock(&suspended_lock);
+	spin_unlock(&suspended_lock);
 
 	return ret;
 }