HID: wacom: generic: Don't sync input on empty input packets
post input_sync only when there are input events posted Signed-off-by: NPing Cheng <ping.cheng@wacom.com> Reviewed-By: NJason Gerecke <jason.gerecke@wacom.com> Signed-off-by: NJiri Kosina <jkosina@suse.cz>
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