treewide: remove FSF address

Remove the paragraph about writing to the Free Software Foundation's
mailing address. The FSF has changed addresses in the past, and may do
so again. In 2021 this is not useful, let's rather have a bit less
boilerplate at the start of source files.

Change-Id: Ic8c69d24141abd183e3b1257f4e9edfd9c1afabe
diff --git a/include/ipa.hrl b/include/ipa.hrl
index f0372f4..a652629 100644
--- a/include/ipa.hrl
+++ b/include/ipa.hrl
@@ -11,10 +11,6 @@
 % but WITHOUT ANY WARRANTY; without even the implied warranty of
 % MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 % GNU General Public License for more details.
-%
-% 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.,
-% 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 
 -ifndef(IPA).
 -define(IPA, true).
diff --git a/src/ipa_proto.erl b/src/ipa_proto.erl
index d1d4396..ceb024a 100644
--- a/src/ipa_proto.erl
+++ b/src/ipa_proto.erl
@@ -14,10 +14,6 @@
 % but WITHOUT ANY WARRANTY; without even the implied warranty of
 % MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 % GNU General Public License for more details.
-%
-% 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.,
-% 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 
 -module(ipa_proto).
 -author('Harald Welte <laforge@gnumonks.org>').
diff --git a/src/ipa_proto_ccm.erl b/src/ipa_proto_ccm.erl
index cfd3863..27ceba9 100644
--- a/src/ipa_proto_ccm.erl
+++ b/src/ipa_proto_ccm.erl
@@ -13,10 +13,6 @@
 % but WITHOUT ANY WARRANTY; without even the implied warranty of
 % MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 % GNU General Public License for more details.
-%
-% 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.,
-% 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 
 -module(ipa_proto_ccm).
 -author('Harald Welte <laforge@gnumonks.org>').