genirq: Add missing __releases() sparse annotation

Add __releases() annotation to address the following sparse warning:

  warning: context imbalance in __irq_put_desc_unlock() - unexpected unlock
Signed-off-by: Jules Irenge <jbi.octave@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20191216144208.29852-1-jbi.octave@gmail.com

kernel/irq/irqdesc.c

@@ -891,6 +891,7 @@ __irq_get_desc_lock(unsigned int irq, unsigned long *flags, bool bus,
 }
 
 void __irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags, bool bus)
+	__releases(&desc->lock)
 {
 	raw_spin_unlock_irqrestore(&desc->lock, flags);
 	if (bus)