diff -urN -X /usr/dontdiff /linux.vanilla/mm/swapfile.c /linux/mm/swapfile.c
--- /linux.vanilla/mm/swapfile.c	Wed Jan 30 01:07:49 2002
+++ /linux/mm/swapfile.c	Tue Jan 29 21:23:46 2002
@@ -1073,7 +1073,7 @@
 	swap_list_unlock();
 	if (swap_map)
 		vfree(swap_map);
-	if (swap_file)
+	if (swap_file && !IS_ERR(swap_file))
 		filp_close(swap_file, NULL);
 out:
 	if (swap_header)