Update to 1.12.3.

*** 1,8 ****
! /*      $Id: tree.c,v 1.47 2011/09/18 14:14:15 schwarze Exp $ */
  /*
   * Copyright (c) 2008, 2009, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
   *
   * Permission to use, copy, modify, and distribute this software for any
   * purpose with or without fee is hereby granted, provided that the above
   * copyright notice and this permission notice appear in all copies.
   *
--- 1,9 ----
! /*      $Id: tree.c,v 1.50 2013/12/24 19:11:46 schwarze Exp $ */
  /*
   * Copyright (c) 2008, 2009, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
+  * Copyright (c) 2013 Ingo Schwarze <schwarze@openbsd.org>
   *
   * Permission to use, copy, modify, and distribute this software for any
   * purpose with or without fee is hereby granted, provided that the above
   * copyright notice and this permission notice appear in all copies.
   *
*** 56,72 ****
  static void
  print_mdoc(const struct mdoc_node *n, int indent)
  {
          const char       *p, *t;
          int               i, j;
!         size_t            argc, sz;
!         char            **params;
          struct mdoc_argv *argv;
  
          argv = NULL;
!         argc = sz = 0;
!         params = NULL;
          t = p = NULL;
  
          switch (n->type) {
          case (MDOC_ROOT):
                  t = "root";
--- 57,71 ----
  static void
  print_mdoc(const struct mdoc_node *n, int indent)
  {
          const char       *p, *t;
          int               i, j;
!         size_t            argc;
          struct mdoc_argv *argv;
  
          argv = NULL;
!         argc = 0;
          t = p = NULL;
  
          switch (n->type) {
          case (MDOC_ROOT):
                  t = "root";
*** 160,173 ****
                                  printf(" [%s]", argv[i].value[j]);
                          if (argv[i].sz > 0)
                                  printf(" ]");
                  }
                  
!                 for (i = 0; i < (int)sz; i++)
!                         printf(" [%s]", params[i]);
! 
!                 printf(" %d:%d\n", n->line, n->pos);
          }
  
          if (n->child)
                  print_mdoc(n->child, indent + 1);
          if (n->next)
--- 159,175 ----
                                  printf(" [%s]", argv[i].value[j]);
                          if (argv[i].sz > 0)
                                  printf(" ]");
                  }
  
!                 putchar(' ');
!                 if (MDOC_LINE & n->flags)
!                         putchar('*');
!                 printf("%d:%d", n->line, n->pos);
!                 if (n->lastline != n->line)
!                         printf("-%d", n->lastline);
!                 putchar('\n');
          }
  
          if (n->child)
                  print_mdoc(n->child, indent + 1);
          if (n->next)