If protocol is auto-dev and the device path is set, unset the protocol
If protocol is auto-dev and the device path is set, unset the protocol

The remainder of the handling code will take try through all protocols,
taking the device into account (as of
xf86-input-synaptics-1.4.0-34-g241254e)

Signed-off-by: Peter Hutterer <b9c50af7afa7642f6f854434cda9ffe54ece8b85@who-t.net>
Reviewed-by: Jeremy Huddleston <db3cec0cba09acb9cf8fd8bd399a3b27498cf883@apple.com>

mad-s/xf86-input-synaptics-absolute,mad-s/xf86-input-synaptics-absolute