Fix ixp4xx compile error

drivers/input/misc/ixp4xx-beeper.c: In function 'ixp4xx_spkr_event':
drivers/input/misc/ixp4xx-beeper.c:54: error: 'input_dev' undeclared (first use in this function)
drivers/input/misc/ixp4xx-beeper.c:54: error: (Each undeclared identifier is reported only once
drivers/input/misc/ixp4xx-beeper.c:54: error: for each function it appears in.)

Signed-off-by: Frederik Deweerdt <frederik.deweerdt@gmail.com>
Acked-by: Dmitry Torokhov <dtor@mail.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/input/misc/ixp4xx-beeper.c

@@ -51,7 +51,7 @@ static void ixp4xx_spkr_control(unsigned int pin, unsigned int count)
 
 static int ixp4xx_spkr_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
 {
-	unsigned int pin = (unsigned int) input_get_drvdata(input_dev);
+	unsigned int pin = (unsigned int) input_get_drvdata(dev);
 	unsigned int count = 0;
 
 	if (type != EV_SND)