bsc_api: Nuke the clear complete from the API.

There is no place where it can be called. Whoever is calling
the gsm0808_clear method should generate the clear complete
as the result.
diff --git a/openbsc/include/openbsc/bsc_api.h b/openbsc/include/openbsc/bsc_api.h
index 22982f0..844e2aa 100644
--- a/openbsc/include/openbsc/bsc_api.h
+++ b/openbsc/include/openbsc/bsc_api.h
@@ -23,7 +23,6 @@
 			 uint16_t rr_cause);
 	int (*clear_request)(struct gsm_subscriber_connection *conn,
 			      uint32_t cause);
-	void (*clear_compl)(struct gsm_subscriber_connection *conn);
 };
 
 int bsc_api_init(struct gsm_network *network, struct bsc_api *api);
diff --git a/openbsc/src/bsc/osmo_bsc_api.c b/openbsc/src/bsc/osmo_bsc_api.c
index f26d6a9..537a9b4 100644
--- a/openbsc/src/bsc/osmo_bsc_api.c
+++ b/openbsc/src/bsc/osmo_bsc_api.c
@@ -54,10 +54,6 @@
 	return 0;
 }
 
-static void bsc_clear_compl(struct gsm_subscriber_connection *conn)
-{
-}
-
 static struct bsc_api bsc_handler = {
 	.sapi_n_reject = bsc_sapi_n_reject,
 	.cipher_mode_compl = bsc_cipher_mode_compl,
@@ -66,7 +62,6 @@
 	.assign_compl = bsc_assign_compl,
 	.assign_fail = bsc_assign_fail,
 	.clear_request = bsc_clear_request,
-	.clear_compl = bsc_clear_compl,
 };
 
 struct bsc_api *osmo_bsc_api()