X touchscreen drivers that don't interpret the designated pen up message
assume a pen up event from a pressure value 0. For these we generate a
pressure 0 message along with the pen up message.
Signed-off-by: NImre Deak <imre.deak@nokia.com>
Acked-by: NJuha Yrjola <juha.yrjola@nokia.com>
Signed-off-by: NDmitry Torokhov <dtor@mail.ru>