Input: hilkbd - 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/Zxr30BpPobpM65vO@google.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Author: dtor

drivers/input/keyboard/hilkbd.c

@@ -180,9 +180,8 @@ static irqreturn_t hil_interrupt(int irq, void *handle)
 /* send a command to the HIL */
 static void hil_do(unsigned char cmd, unsigned char *data, unsigned int len)
 {
-	unsigned long flags;
+	guard(spinlock_irqsave)(&hil_dev.lock);
 
-	spin_lock_irqsave(&hil_dev.lock, flags);
 	while (hil_busy())
 		/* wait */;
 	hil_command(cmd);
@@ -191,7 +190,6 @@ static void hil_do(unsigned char cmd, unsigned char *data, unsigned int len)
 			/* wait */;
 		hil_write_data(*(data++));
 	}
-	spin_unlock_irqrestore(&hil_dev.lock, flags);
 }