Fix memory leak in Lz4CompressionCodec
Fix memory leak in Lz4CompressionCodec

Summary: we should free the stream.

Reviewed By: andreazevedo

Differential Revision: D3313502

fbshipit-source-id: 5ecb9c297f2def2588390ce43c762a34a472f19c

facebook/mcrouter,yqzhang/mcrouter,facebook/mcrouter,facebook/mcrouter,facebook/mcrouter,yqzhang/mcrouter,yqzhang/mcrouter,yqzhang/mcrouter