nilfs2: merge list_del()/list_add_tail() to list_move_tail()

Merge list_del() + list_add_tail() to list_move_tail().

Signed-off-by: Nicolas Kaiser <nikai@nikai.net>
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
diff --git a/fs/nilfs2/inode.c b/fs/nilfs2/inode.c
index c0aa274..2cc8c08 100644
--- a/fs/nilfs2/inode.c
+++ b/fs/nilfs2/inode.c
@@ -872,8 +872,7 @@
 			return -EINVAL; /* NILFS_I_DIRTY may remain for
 					   freeing inode */
 		}
-		list_del(&ii->i_dirty);
-		list_add_tail(&ii->i_dirty, &nilfs->ns_dirty_files);
+		list_move_tail(&ii->i_dirty, &nilfs->ns_dirty_files);
 		set_bit(NILFS_I_QUEUED, &ii->i_state);
 	}
 	spin_unlock(&nilfs->ns_inode_lock);