removing unused tmp var in NS_Node.add_child
removing unused tmp var in NS_Node.add_child

tabo/django-treebeard,skirsdeda/django-treebeard,tabo/django-treebeard,skirsdeda/django-treebeard,django-treebeard/django-treebeard,tabo/django-treebeard,skirsdeda/django-treebeard,skirsdeda/django-treebeard,django-treebeard/django-treebeard,tabo/django-treebeard,django-treebeard/django-treebeard