gscon_forget_lchan(): no Clear Request after Clear Command

Send a BSSMAP Clear Request only if we are not already in ST_CLEARING, i.e.
haven't received a BSSMAP Clear Command yet.

Related: osmo-ttcn3-hacks If772dbbc5f9790d3f911465e1303dd0a99811154
Change-Id: Idc749068580da45e821e0af04cfa14cc7ce5c432
diff --git a/src/osmo-bsc/bsc_subscr_conn_fsm.c b/src/osmo-bsc/bsc_subscr_conn_fsm.c
index 32375d4..3c9be56 100644
--- a/src/osmo-bsc/bsc_subscr_conn_fsm.c
+++ b/src/osmo-bsc/bsc_subscr_conn_fsm.c
@@ -644,7 +644,9 @@
 		conn->ho.new_lchan = NULL;
 	if (conn->lchan == lchan)
 		conn->lchan = NULL;
-	if (!conn->lchan)
+
+	if (conn->fi->state != ST_CLEARING
+	    && !conn->lchan)
 		gscon_bssmap_clear(conn, GSM0808_CAUSE_EQUIPMENT_FAILURE);
 }