HID: wacom: use wacom_wac_finger_count_touches to set touch_down
Counting number of touching fingers by wacom_wac_finger_count_touches so we don't have to count them inside individual routines. Signed-off-by: NPing Cheng <pingc@wacom.com> Reviewed-by: NJason Gerecke <jason.gerecke@wacom.com> Signed-off-by: NJiri Kosina <jkosina@suse.cz>
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