msc: as_clear_cmd_compl_disc: log unexpected message

When receiving an unexpected BSSMAP message that fails the test, log it.

Change-Id: I5cafac3318a50567f1916ea670af55558e97bf17
diff --git a/msc/BSC_ConnectionHandler.ttcn b/msc/BSC_ConnectionHandler.ttcn
index b041007..2cd666f 100644
--- a/msc/BSC_ConnectionHandler.ttcn
+++ b/msc/BSC_ConnectionHandler.ttcn
@@ -776,6 +776,7 @@
 }
 /* expect a clear command */
 altstep as_clear_cmd_compl_disc(float t := 5.0) runs on BSC_ConnHdlr {
+	var PDU_BSSAP bssap;
 	[] BSSAP.receive(tr_BSSMAP_ClearCommand) {
 		BSSAP.send(ts_BSSMAP_ClearComplete);
 		alt {
@@ -788,8 +789,8 @@
 			}
 		}
 		}
-	[] BSSAP.receive {
-		setverdict(fail, "Unexpected BSSMAP while waiting for ClearCommand");
+	[] BSSAP.receive(tr_BSSAP_BSSMAP) -> value bssap {
+		setverdict(fail, "Unexpected BSSMAP while waiting for ClearCommand", bssap);
 		mtc.stop;
 		}
 }