eventcomm: add missing axis labels to avoid array overrun
eventcomm: add missing axis labels to avoid array overrun

And warn when we run out of labels.

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