fix FSF address in sources/headers

Signed-off-by: Jaroslav Škarvada <jskarvad@redhat.com>
diff --git a/src/rbtree.c b/src/rbtree.c
index 4e7c0f3..f0ebb8c 100644
--- a/src/rbtree.c
+++ b/src/rbtree.c
@@ -15,7 +15,8 @@
 
   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
 
   linux/lib/rbtree.c
 */