rt2x00: Only register rfkill input when key is present

rt2x00 should only register the RFKILL input device when the hardware indicated
the key was present.
Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/rt2x00/rt2x00rfkill.c

@@ -87,7 +87,8 @@ void rt2x00rfkill_allocate(struct rt2x00_dev *rt2x00dev)
 {
 	struct input_polled_dev *poll_dev;
 
-	if (test_bit(RFKILL_STATE_ALLOCATED, &rt2x00dev->rfkill_state))
+	if (test_bit(RFKILL_STATE_ALLOCATED, &rt2x00dev->rfkill_state) ||
+	    !test_bit(CONFIG_SUPPORT_HW_BUTTON, &rt2x00dev->flags))
 		return;
 
 	poll_dev = input_allocate_polled_device();