evdev-touchpad: Iterate over the touchpad spec table correctly

The original code would overrun since the calculation of the range did not
take into consideration the size of the entries in the table.

Cc:Jonas Ådahl <jadahl@gmail.com>
Signed-off-by: Rob Bradford <rob@linux.intel.com>

src/evdev-touchpad.c

@@ -134,7 +134,7 @@ get_touchpad_model(struct evdev_device *device)
 	if (ioctl(device->fd, EVIOCGID, &id) < 0)
 		return TOUCHPAD_MODEL_UNKNOWN;
 
-	for (i = 0; i < sizeof touchpad_spec_table; i++)
+	for (i = 0; ARRAY_LENGTH(touchpad_spec_table); i++)
 		if (touchpad_spec_table[i].vendor == id.vendor &&
 		    (!touchpad_spec_table[i].product ||
 		     touchpad_spec_table[i].product == id.product))