sip: drop unused var

Change-Id: Id09760238c0e46de2c06e2cc5e7cfd1ffe84cb64
diff --git a/sip/SIP_Tests.ttcn b/sip/SIP_Tests.ttcn
index 1e3c43f..58000d5 100644
--- a/sip/SIP_Tests.ttcn
+++ b/sip/SIP_Tests.ttcn
@@ -192,7 +192,6 @@
 function f_establish_mt(inout CallPars cp) runs on ConnHdlr {
 	var template SipAddr sip_addr_gsm := tr_SipAddr_from_val(cp.comp.sip_url_gsm);
 	var template SipAddr sip_addr_ext := tr_SipAddr_from_val(cp.comp.sip_url_ext);
-	var PDU_SIP_Request sip_req;
 	var PDU_SIP_Response sip_resp;
 	var MNCC_PDU mncc;