mufs: fix syncing issue in write_dirent()

source/fs/mufs/dir.c

@@ -293,8 +293,8 @@ size_t write_dirent(struct mufs_tree *tree,
 	if (mufs_tree_write(tree, &entry, va + offset, sizeof entry) == 0)
 		return 0;
 
-	tree->file_size = max(tree->file_size, va + offset + sizeof entry +
-		entry.path_len);
+	va += offset + sizeof entry + entry.path_len;
+	tree->file_size = max(tree->file_size, va);
 
 	if (tree->file_size <= va && mufs_sync_tree(tree) < 0)
 		return 0;