Fix coding style of bfs_mount.cc
Fix coding style of bfs_mount.cc

yvxiang/dfs,baidu/bfs,00k/ToyDFS,bluebore/bfs,linyvxiang/dfs,imotai/bfs,bluebore/dfs,yvxiang/dfs,yvxiang/coverage_for_bfs,bluebore/bfs,myawan/bfs-1,yvxiang/coverage_for_bfs,lylei/dfs,lylei/dfs,baidu/bfs,baidu/bfs,imotai/bfs,linyvxiang/dfs,bluebore/dfs,yvxiang/dfs,myawan/bfs-1,yvxiang/coverage_for_bfs,baidu/bfs,yvxiang/coverage_for_bfs,linyvxiang/dfs,myawan/bfs-1,myawan/bfs-1,lylei/dfs,imotai/bfs,bluebore/dfs,00k/ToyDFS,lylei/dfs,yvxiang/dfs,bluebore/bfs