backport: HID: wacom: remove unused hid_data::pressure

The pressure member in struct hid_data is unused. It was
added in commit 5ae6e89f7409 (HID: wacom: implement the finger part of
the HID generic handling), but never used.

As this is not a struct to communicate with the HW, remove that member.

Found by https://github.com/jirislaby/clang-struct.

Signed-off-by: Jiri Slaby (SUSE) <[email protected]>
Cc: Ping Cheng <[email protected]>
Cc: Jason Gerecke <[email protected]>
Cc: Jiri Kosina <[email protected]>
Cc: Benjamin Tissoires <[email protected]>
Acked-by: Ping Cheng <[email protected]>
Signed-off-by: Jiri Kosina <[email protected]>
[[email protected]: Imported into input-wacom (dcd5231f093b)]
Signed-off-by: Jason Gerecke <[email protected]>
[[email protected]: Backported from input-wacom (ca314d5)]
Signed-off-by: Jason Gerecke <[email protected]>

3.17/wacom_wac.h

@@ -331,7 +331,6 @@ struct hid_data {
 	bool confidence;
 	int x;
 	int y;
-	int pressure;
 	int width;
 	int height;
 	int id;