When resetting, reset the open slots to -1
When resetting, reset the open slots to -1

open_slots holds the slot index, resetting it to 0 is a bad idea. And make
sure that we do reset after DEVICE_INIT. We already do so on DEVICE_CLOSE, but
after the first DEVICE_ON the data could still be random.

Signed-off-by: Peter Hutterer <b9c50af7afa7642f6f854434cda9ffe54ece8b85@who-t.net>
Reviewed-by: Keith Packard <fd7f967895e9f35e58ec8a62a847a54d7fa7275f@keithp.com>

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