media: i2c: max96717: clean up on error in max96717_subdev_init()

media: i2c: max96717: clean up on error in max96717_subdev_init()

Call v4l2_ctrl_handler_free() to clean up from v4l2_ctrl_handler_init().

Fixes: 19b5e5511ca4 ("media: i2c: max96717: add test pattern ctrl")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Reviewed-by: Julien Massot <julien.massot@collabora.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>