valgrind reports invalid free()'s due to xml_rootparent construct

[halhen]

Valgrind reports invalid free()'s due to the xml_rootparent construct in 0.0.1. When using the xmlDoc's root node as xml_rootparent it seems fine.

To view output: $ make clean; make CFLAGS="-g"; $ valgrind --tool=memcheck --leak-check=yes ./xmlfs mnt/ -f < test.xml