media: i2c: mt9m114: Fix missing error unwind in probe()

Two paths in the probe function return directly instead of jumping to
error handling. Fix them.

Fixes: 24d756e9 ("media: i2c: Add driver for onsemi MT9M114 camera sensor")
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>