The control handler is leaked in some probe-time error paths, as well as
in the remove path. Fix it.

Fixes: 66d8c9d2 ("media: i2c: Add MAX9286 driver")
Signed-off-by: NLaurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: NNiklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Reviewed-by: NJacopo Mondi <jacopo.mondi@ideasonboard.com>
Signed-off-by: NSakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@kernel.org>