Input: fix the example of an input device driver

This patch fixes a wrong interrupt handler example given in the "Hello,
world!"-like input driver in Documentation/input/input-programming.txt.

Signed-off-by: Dmitri Vorobiev <[e-mail]>
Signed-off-by: Randy Dunlap <[e-mail]>
Signed-off-by: Dmitry Torokhov <[e-mail]>

Documentation/input/input-programming.txt

···
 
 static struct input_dev *button_dev;
 
-static void button_interrupt(int irq, void *dummy, struct pt_regs *fp)
+static irqreturn_t button_interrupt(int irq, void *dummy)
 {
 	input_report_key(button_dev, BTN_0, inb(BUTTON_PORT) & 1);
 	input_sync(button_dev);
+	return IRQ_HANDLED;
 }
 
 static int __init button_init(void)