py-smbus: Fix FSF address in smbusmodule.c

The Free Software Foundation address was outdated. Discovered by
Fedora's rpmlint. The current address can be found at:
https://www.gnu.org/licenses/old-licenses/gpl-2.0.html#SEC4

Signed-off-by: Ondřej Lysoněk <olysonek@redhat.com>

py-smbus/smbusmodule.c

@@ -13,7 +13,8 @@
  * 
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301, USA.
  */
 
 #include <Python.h>