media: i2c: ov5647: replacing of_node_put with __free(device_node)

Replace instance of of_node_put with __free(device_node)
to protect against any memory leaks due to future changes
in control flow.

Signed-off-by: Abdulrasaq Lawani <abdulrasaqolawani@gmail.com>
Acked-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>