media: s5k4ecgx: delete a bogus error message

This function prints an error message on success.  I don't have the
hardware, I just noticed this while reading the code.

Fixes: 8b99312b

 ("[media] Add v4l2 subdev driver for S5K4ECGX sensor")

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>