The just parsed endpoint fwnode has to be put after use.
Currently this is done only in error handling path. Fix that by
putting node unconditionally after use.

Fixes: 01b84448 ("media: v4l2: i2c: ov7670: Implement OF mbus configuration")
Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>