OSG-3.4.0: beautify code.
OSG-3.4.0: beautify code.

By: ying.huang.

hyyh619/OpenSceneGraph-3.4.0,hyyh619/OpenSceneGraph-3.4.0,hyyh619/OpenSceneGraph-3.4.0,hyyh619/OpenSceneGraph-3.4.0,hyyh619/OpenSceneGraph-3.4.0