Fix bug in dom_node_destroy -- Document nodes have no owner, so attempting to ref/unref it is stupid
Fix bug in dom_node_destroy -- Document nodes have no owner, so attempting to ref/unref it is stupid

svn path=/trunk/dom/; revision=3538

Achal-Aggarwal/libdom,dunkelstern/libdom,prepare/netsurf_libdom,dunkelstern/libdom,prepare/netsurf_libdom,Achal-Aggarwal/libdom,prepare/netsurf_libdom,dunkelstern/libdom,prepare/netsurf_libdom,dunkelstern/libdom,dunkelstern/libdom,Achal-Aggarwal/libdom,dunkelstern/libdom,Achal-Aggarwal/libdom,prepare/netsurf_libdom,Achal-Aggarwal/libdom,Achal-Aggarwal/libdom,prepare/netsurf_libdom