Prevent LLFace::getGeometryVolume from overwriting vbos past their end.
Prevent LLFace::getGeometryVolume from overwriting vbos past their end.

gabeharms/firestorm,gabeharms/firestorm,gabeharms/firestorm,gabeharms/firestorm,gabeharms/firestorm,gabeharms/firestorm,gabeharms/firestorm,gabeharms/firestorm,gabeharms/firestorm