Fix crash bug in mxmlWrite functions (Issue #228)

CHANGES.md

@@ -8,7 +8,8 @@
 - The `mxmlNewCDATA` and `mxmlSetCDATA` functions incorrectly added the XML
   trailer "]]" to the string (Issue #216)
 - Cross-compiling failed on install (Issue #218)
-- Updated the ZIP container library used for mxmldoc.
+- Fixed a crash bug in the `mxmlWrite` functions (Issue #228)
+- Updated the markdown and ZIP container libraries used for mxmldoc.
 
 
 # Changes in Mini-XML 2.11

mxml-file.c

@@ -1,7 +1,7 @@
 /*
  * File loading code for Mini-XML, a small XML file parsing library.
  *
- * Copyright 2003-2017 by Michael R Sweet.
+ * Copyright 2003-2018 by Michael R Sweet.
  *
  * These coded instructions, statements, and computer programs are the
  * property of Michael R Sweet and are protected by Federal copyright
@@ -2974,7 +2974,7 @@ mxml_write_node(mxml_node_t     *node,	/* I - Node to write */
     {
       while ((next = current->next) == NULL)
       {
-        if (current == node)
+        if (current == node || !current->parent)
           break;
 
        /*

mxmldoc.c

@@ -3,7 +3,7 @@
  * Documentation generator using Mini-XML, a small XML file parsing
  * library.
  *
- * Copyright 2003-2017 by Michael R Sweet.
+ * Copyright 2003-2018 by Michael R Sweet.
  *
  * These coded instructions, statements, and computer programs are the
  * property of Michael R Sweet and are protected by Federal copyright