Grab fix from upstream for incorrect error msg display.

http://bugs.gentoo.org/96009

Index: regexp.c
===================================================================
RCS file: /cvsroot/sed/sed/sed/regexp.c,v
retrieving revision 1.3
retrieving revision 1.4
diff -u -r1.3 -r1.4
--- sed/regexp.c	27 Jan 2005 08:04:30 -0000	1.3
+++ sed/regexp.c	10 Feb 2005 09:54:50 -0000	1.4
@@ -113,7 +113,7 @@
     {
       char buf[200];
       sprintf(buf, _("invalid reference \\%d on `s' command's RHS"),
-	      needed_sub);
+	      needed_sub - 1);
       bad_prog(buf);
     }
 }