show return code when sending L1CTL_FBSB_REQ fails

Provide a little bit more information when a BTS test fails
due to L1CTL FBSB failure.

Example output:
Test case TC_si_sched_default finished. Verdict: fail reason: \
  FBSB Failed with non-zero return code 255

Change-Id: I5e8f23a2615b64bdf3167d486ba808c93f0f4b23
diff --git a/library/L1CTL_PortType.ttcn b/library/L1CTL_PortType.ttcn
index 14a059c..8e03c02 100644
--- a/library/L1CTL_PortType.ttcn
+++ b/library/L1CTL_PortType.ttcn
@@ -35,12 +35,13 @@
 	function f_L1CTL_FBSB(L1CTL_PT pt, Arfcn arfcn, L1ctlCcchMode ccch_mode := CCCH_MODE_COMBINED, integer rxlev_exp := 57) {
 		timer T := 15.0;
 		for (var integer i := 0; i < 10; i := i+1) {
+			var L1ctlDlMessage dl;
 			pt.send(ts_L1CTL_FBSB_REQ(arfcn, valueof(t_L1CTL_FBSB_F_ALL), 0, ccch_mode, rxlev_exp));
 			T.start
 			alt {
 			[] pt.receive(tr_L1CTL_FBSB_CONF(0)) { return; };
-			[i >= 9] pt.receive(tr_L1CTL_FBSB_CONF(?)) {
-				setverdict(fail, "FBSB Failed with non-zero return code");
+			[i >= 9] pt.receive(tr_L1CTL_FBSB_CONF(?)) -> value dl {
+				setverdict(fail, "FBSB Failed with non-zero return code ", dl.payload.fbsb_conf.result);
 				mtc.stop;
 				};
 			[] pt.receive(tr_L1CTL_FBSB_CONF(?)) {