HID: wacom: Fix ABS_MISC reporting for Cintiq Companion 2

The pad handling code introduced for the Cintiq Companion 2 (f7acb55)
looks at the wrong bytes in the report when deciding whether ABS_MISC
should be sent. This does not cause any issues with the X driver now
that the pen and pad have been split to separate devices, but is
incorrect and has caused issues when backporting to distros with pre-
3.17 kernels.

Signed-off-by: Jason Gerecke <jason.gerecke@wacom.com>
Reviewed-by: Ping Cheng <pingc@wacom.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

drivers/hid/wacom_wac.c

@@ -966,7 +966,7 @@ static int wacom_intuos_irq(struct wacom_wac *wacom)
 			input_report_key(input, BTN_A, (data[2] & 0x80));  /* Down   */
 			input_report_key(input, BTN_0, (data[1] & 0x01));  /* Center */
 
-			if (data[4] | (data[3] & 0x01)) {
+			if (data[2] | (data[1] & 0x07)) {
 				input_report_abs(input, ABS_MISC, PAD_DEVICE_ID);
 			} else {
 				input_report_abs(input, ABS_MISC, 0);