sgsn: f_TC_attach_closed_foreign: fail on recv an Attach Accept

The test expect a reject. Recv an attach accept should fail then.

Change-Id: I8a4ae6aaaa71dabb1d8a2ee7585e624b962a3500
diff --git a/sgsn/SGSN_Tests.ttcn b/sgsn/SGSN_Tests.ttcn
index 17abb95..466c3ed 100644
--- a/sgsn/SGSN_Tests.ttcn
+++ b/sgsn/SGSN_Tests.ttcn
@@ -706,6 +706,9 @@
 	[] BSSGP.receive(tr_BD_L3_MT(tr_GMM_ATTACH_REJECT(?))) {
 		setverdict(pass);
 		}
+	[] BSSGP.receive(tr_BD_L3_MT(tr_GMM_ATTACH_ACCEPT(*, *, *))) {
+		setverdict(fail);
+		}
 	}
 }
 testcase TC_attach_closed() runs on test_CT {