Input: make EVIOCGSND return meaningful data

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

drivers/input/input.c

@@ -155,6 +155,9 @@ void input_event(struct input_dev *dev, unsigned int type, unsigned int code, in
 			if (code > SND_MAX || !test_bit(code, dev->sndbit))
 				return;
 
+			if (!!test_bit(code, dev->snd) != !!value)
+				change_bit(code, dev->snd);
+
 			if (dev->event) dev->event(dev, type, code, value);
 
 			break;