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/segment.c b/fs/nilfs2/segment.c
index afe4f21..5deeadd 100644
--- a/fs/nilfs2/segment.c
+++ b/fs/nilfs2/segment.c
@@ -1991,8 +1991,7 @@
 
 		clear_bit(NILFS_I_QUEUED, &ii->i_state);
 		set_bit(NILFS_I_BUSY, &ii->i_state);
-		list_del(&ii->i_dirty);
-		list_add_tail(&ii->i_dirty, &sci->sc_dirty_files);
+		list_move_tail(&ii->i_dirty, &sci->sc_dirty_files);
 	}
 	spin_unlock(&nilfs->ns_inode_lock);
 
@@ -2014,8 +2013,7 @@
 		clear_bit(NILFS_I_BUSY, &ii->i_state);
 		brelse(ii->i_bh);
 		ii->i_bh = NULL;
-		list_del(&ii->i_dirty);
-		list_add_tail(&ii->i_dirty, &ti->ti_garbage);
+		list_move_tail(&ii->i_dirty, &ti->ti_garbage);
 	}
 	spin_unlock(&nilfs->ns_inode_lock);
 }