[Bug-tar] invalid diagnostic

[Jim Meyering]

I found this by inspection.
This changes makes the diagnostic use `keyword', defined like this:

  static char *keyword = "GNU.sparse.map";

rather than the hard-coded (and wrong) "GNU.sparse.numbytes":

2006-02-07  Jim Meyering  <address@hidden>

        * src/xheader.c (sparse_map_decoder): Fix misleading diagnostic.

Index: src/xheader.c
===================================================================
RCS file: /cvsroot/tar/tar/src/xheader.c,v
retrieving revision 1.39
diff -u -p -r1.39 xheader.c
--- src/xheader.c       27 Nov 2005 11:59:34 -0000      1.39
+++ src/xheader.c       7 Feb 2006 10:33:39 -0000
@@ -1,6 +1,6 @@
 /* POSIX extended headers for tar.
 
-   Copyright (C) 2003, 2004, 2005 Free Software Foundation, Inc.
+   Copyright (C) 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
 
    This program is free software; you can redistribute it and/or modify it
    under the terms of the GNU General Public License as published by the
@@ -1249,7 +1249,7 @@ sparse_map_decoder (struct tar_stat_info
          else
            {
              ERROR ((0, 0, _("Malformed extended header: excess %s=%s"),
-                     "GNU.sparse.numbytes", arg));
+                     keyword, arg));
              return;
            }
        }