ocfs2: clean up some dead code

clean up some unused functions and parameters.

Link: http://lkml.kernel.org/r/598A5E21.2080807@huawei.com
Signed-off-by: Jun Piao <piaojun@huawei.com>
Reviewed-by: Alex Chen <alex.chen@huawei.com>
Cc: Mark Fasheh <mfasheh@versity.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Joseph Qi <jiangqi903@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/fs/ocfs2/dir.c b/fs/ocfs2/dir.c
index 3ecb9f3..febe631 100644
--- a/fs/ocfs2/dir.c
+++ b/fs/ocfs2/dir.c
@@ -3249,7 +3249,7 @@ static int ocfs2_extend_dir(struct ocfs2_super *osb,
 		spin_unlock(&OCFS2_I(dir)->ip_lock);
 		ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(dir),
 					      parent_fe_bh);
-		num_free_extents = ocfs2_num_free_extents(osb, &et);
+		num_free_extents = ocfs2_num_free_extents(&et);
 		if (num_free_extents < 0) {
 			status = num_free_extents;
 			mlog_errno(status);