Update the address of the Free Software Foundation.

include/dpnathlp.h

diff --git a/include/dpnathlp.h b/include/dpnathlp.h
index c31a3da..68c0456 100644
--- a/include/dpnathlp.h
+++ b/include/dpnathlp.h
@@ -13,7 +13,7 @@
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  */
 
 #ifndef __DPNATHLP_H__