9718 update mandoc to 1.14.4

@@ -1,6 +1,6 @@
-/*      $Id: mdoc_markdown.c,v 1.23 2017/06/14 01:31:26 schwarze Exp $ */
+/*      $Id: mdoc_markdown.c,v 1.24 2018/04/11 17:11:13 schwarze Exp $ */
 /*
  * Copyright (c) 2017 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

@@ -292,11 +292,11 @@
 md_node(struct roff_node *n)
 {
         const struct md_act     *act;
         int                      cond, process_children;
 
-        if (n->flags & NODE_NOPRT)
+        if (n->type == ROFFT_COMMENT || n->flags & NODE_NOPRT)
                 return;
 
         if (outflags & MD_nonl)
                 outflags &= ~(MD_nl | MD_sp);
         else if (outflags & MD_spc && n->flags & NODE_LINE)