msc: TC_gsup_cancel: end with f_expect_clear() to avoid broken pipe

Change-Id: I3b3ae0b9c3f02f523dfb60c9efb732db3ade2785
diff --git a/msc/MSC_Tests.ttcn b/msc/MSC_Tests.ttcn
index 5d40f09..31a7401 100644
--- a/msc/MSC_Tests.ttcn
+++ b/msc/MSC_Tests.ttcn
@@ -1596,6 +1596,8 @@
 		mtc.stop;
 		}
 	}
+
+	f_expect_clear();
 	setverdict(pass);
 }
 testcase TC_gsup_cancel() runs on MTC_CT {