Input: q40kbd - use guard notation when acquiring spinlock

Using guard notation makes the code more compact and error handling
more robust by ensuring that locks are released in all code paths
when control leaves critical section.

Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Dmitry Torokhov <[email protected]>

Author: dtor

drivers/input/serio/q40kbd.c

@@ -39,17 +39,14 @@ struct q40kbd {
 static irqreturn_t q40kbd_interrupt(int irq, void *dev_id)
 {
 	struct q40kbd *q40kbd = dev_id;
-	unsigned long flags;
 
-	spin_lock_irqsave(&q40kbd->lock, flags);
+	guard(spinlock_irqsave)(&q40kbd->lock);
 
 	if (Q40_IRQ_KEYB_MASK & master_inb(INTERRUPT_REG))
 		serio_interrupt(q40kbd->port, master_inb(KEYCODE_REG), 0);
 
 	master_outb(-1, KEYBOARD_UNLOCK_REG);
 
-	spin_unlock_irqrestore(&q40kbd->lock, flags);
-
 	return IRQ_HANDLED;
 }
 
@@ -60,14 +57,11 @@ static irqreturn_t q40kbd_interrupt(int irq, void *dev_id)
 static void q40kbd_flush(struct q40kbd *q40kbd)
 {
 	int maxread = 100;
-	unsigned long flags;
 
-	spin_lock_irqsave(&q40kbd->lock, flags);
+	guard(spinlock_irqsave)(&q40kbd->lock);
 
 	while (maxread-- && (Q40_IRQ_KEYB_MASK & master_inb(INTERRUPT_REG)))
 		master_inb(KEYCODE_REG);
-
-	spin_unlock_irqrestore(&q40kbd->lock, flags);
 }
 
 static void q40kbd_stop(void)