ocfs2: Remove open coded readdir()

ocfs2_queue_orphans() has an open coded readdir loop which can easily just
use a directory accessor function.

Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
Reviewed-by: Joel Becker <joel.becker@oracle.com>

diff --cc fs/ocfs2/dir.c
Simple merge

diff --cc fs/ocfs2/dir.h
Simple merge

diff --cc fs/ocfs2/journal.c
Simple merge