lib/bssmap: Introduce function f_bssmap_ie_cic_2_int()

Function will be re-used in forthcoming commits.

Change-Id: Ifc7444ecca1571959ed83b43d3c7461c637686ae
diff --git a/library/RAN_Emulation.ttcnpp b/library/RAN_Emulation.ttcnpp
index cd0c867..de5b7f3 100644
--- a/library/RAN_Emulation.ttcnpp
+++ b/library/RAN_Emulation.ttcnpp
@@ -422,7 +422,7 @@
 		    ispresent(bssap.pdu.bssmap.assignmentRequest.circuitIdentityCode)) {
 			var BSSMAP_IE_CircuitIdentityCode cic_ie :=
 				bssap.pdu.bssmap.assignmentRequest.circuitIdentityCode;
-			var integer cic := (oct2int(cic_ie.cicHigh) * 256) + oct2int(cic_ie.cicLow);
+			var integer cic := f_bssmap_ie_cic_2_int(cic_ie);
 			f_comp_store_cic(client, cic);
 		}
 	}