bsc: TC_ho_in_fail_mgw_mdcx_timeout: fixup

Fix that the test was torn down too early, before DLCX messages were
received from OsmoBSC. This caused a race condition that sometimes
failed the test with:

VirtMGW-MGCP-0(1996)@e5a096d6b4ff: Dynamic test case error: Sending data on the connection of port MGCP_CLIENT to 1999:MGCP failed. (Broken pipe)

Related: OS#5787
Fixes: 7a8594a8 ("bsc: TC_ho_in_fail_mgw_mdcx_timeout: new test")
Change-Id: If47fa3e0204ce841c79a67dd78a1c53d04e4a586
diff --git a/bsc/BSC_Tests.ttcn b/bsc/BSC_Tests.ttcn
index 9a2718a..b9182e3 100644
--- a/bsc/BSC_Tests.ttcn
+++ b/bsc/BSC_Tests.ttcn
@@ -6347,6 +6347,15 @@
 	if (g_pars.expect_ho_fail_lchan_est) {
 		BSSAP.receive(tr_BSSMAP_HandoverFailure);
 		setverdict(pass);
+
+		/* When we let MGCP MDCX run into a timeout, it's still in the
+		 * queue and additionally after BSSAP HandoverFailure, two DLCX
+		 * get sent. */
+		if (g_pars.ignore_mgw_mdcx) {
+			MGCP.receive(tr_MDCX);
+			MGCP.receive(tr_DLCX);
+			MGCP.receive(tr_DLCX);
+		}
 		return;
 	}