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: I0ad20cdf1e571c1a15f6e67d46e07155a6a02520
diff --git a/src/input/dahdi.c b/src/input/dahdi.c
index 6dee0d7..acf1f94 100644
--- a/src/input/dahdi.c
+++ b/src/input/dahdi.c
@@ -18,10 +18,6 @@
  * 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.
- *
  */
 
 #include "config.h"
diff --git a/src/input/e1d.c b/src/input/e1d.c
index cab219d..a959b40 100644
--- a/src/input/e1d.c
+++ b/src/input/e1d.c
@@ -16,10 +16,6 @@
  * 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.
- *
  */
 
 #include "config.h"
diff --git a/src/input/ipa_keepalive.c b/src/input/ipa_keepalive.c
index 172a36f..7fc28f1 100644
--- a/src/input/ipa_keepalive.c
+++ b/src/input/ipa_keepalive.c
@@ -16,10 +16,6 @@
  * 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.
- *
  */
 
 #include <osmocom/core/fsm.h>
diff --git a/src/input/lapd.c b/src/input/lapd.c
index 6f1e270..130e4c3 100644
--- a/src/input/lapd.c
+++ b/src/input/lapd.c
@@ -20,10 +20,6 @@
  * 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.
- *
  */
 
 #include "internal.h"
diff --git a/src/input/unixsocket.c b/src/input/unixsocket.c
index 595dc7d..069f9c6 100644
--- a/src/input/unixsocket.c
+++ b/src/input/unixsocket.c
@@ -18,10 +18,6 @@
  * 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.
- *
  */
 
 #include <errno.h>
diff --git a/src/trau/osmo_ortp.c b/src/trau/osmo_ortp.c
index 011f097..5761d78 100644
--- a/src/trau/osmo_ortp.c
+++ b/src/trau/osmo_ortp.c
@@ -14,10 +14,6 @@
  * 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.
- *
  */
 
 /*! \file osmo_ortp.c