nilfs2: use list_splice_tail or list_splice_tail_init

This applies list_splice_tail (or list_splice_tail_init) operation
instead of list_splice (or list_splice_init, respectively) to append a
new list to tail of an existing list.

Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
diff --git a/fs/nilfs2/segment.c b/fs/nilfs2/segment.c
index 097f9c4..79acf4d 100644
--- a/fs/nilfs2/segment.c
+++ b/fs/nilfs2/segment.c
@@ -1363,7 +1363,7 @@
 		list_add_tail(&segbuf->sb_list, &list);
 		prev = segbuf;
 	}
-	list_splice(&list, sci->sc_segbufs.prev);
+	list_splice_tail(&list, &sci->sc_segbufs);
 	return 0;
 
  failed_segbuf:
@@ -2532,7 +2532,7 @@
 
 	sci->sc_freesegs = kbufs[4];
 	sci->sc_nfreesegs = argv[4].v_nmembs;
-	list_splice_init(&nilfs->ns_gc_inodes, sci->sc_gc_inodes.prev);
+	list_splice_tail_init(&nilfs->ns_gc_inodes, &sci->sc_gc_inodes);
 
 	for (;;) {
 		nilfs_segctor_accept(sci, &req);