Input: elo - fix an error code in elo_connect()

If elo_setup_10() fails then this should return an error code instead
of success.

Fixes: fae3006e ("Input: elo - add support for non-pressure-sensitive touchscreens")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Link: https://lore.kernel.org/r/YBKFd5CvDu+jVmfW@mwanda


Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>