[telnet] Remove unused variables from the telnet interface

These became unused when the interface was switched to
use the vty module. It is about time to remove these.
diff --git a/openbsc/include/openbsc/telnet_interface.h b/openbsc/include/openbsc/telnet_interface.h
index 97357d7..d3381e0 100644
--- a/openbsc/include/openbsc/telnet_interface.h
+++ b/openbsc/include/openbsc/telnet_interface.h
@@ -35,13 +35,6 @@
 	struct gsm_network *network;
 	struct bsc_fd fd;
 	struct vty *vty;
-
-	int bts;
-
-	int command;
-	char *imsi;
-	char commands[1024];
-	int read;
 };
 
 
diff --git a/openbsc/src/telnet_interface.c b/openbsc/src/telnet_interface.c
index d7c9055..128c34e 100644
--- a/openbsc/src/telnet_interface.c
+++ b/openbsc/src/telnet_interface.c
@@ -165,7 +165,6 @@
 	connection->fd.fd = new_connection;
 	connection->fd.when = BSC_FD_READ;
 	connection->fd.cb = client_data;
-	connection->bts = 0;
 	bsc_register_fd(&connection->fd);
 	llist_add_tail(&connection->entry, &active_connections);