fix ha/ms fseek bug
fix ha/ms fseek bug

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