sgsn: Remove uneeded f_gtpu_send in f_gtpu_xceive_mo

It's not needed for the functionality/scenario of f_gtpu_xceive_mo. It
probably was left in when creating it from f_gtpu_xceive_mo.

Change-Id: Ide226f8501c4598e2bfaa5f1ea62c3ff20807ce4
diff --git a/sgsn/SGSN_Tests.ttcn b/sgsn/SGSN_Tests.ttcn
index d7e956f..d76c182 100644
--- a/sgsn/SGSN_Tests.ttcn
+++ b/sgsn/SGSN_Tests.ttcn
@@ -1117,12 +1117,12 @@
 	}
 }
 
+/* Transceive given 'payload' as MT message from Gb -> OsmoSGSN -> GTP */
 private function f_gtpu_xceive_mo(inout PdpActPars apars, octetstring payload) runs on BSSGP_ConnHdlr {
 	/* Send PDU via SNDCP/LLC/BSSGP/NS via simulated MS/PCU to the SGSN */
 	var GtpPeer peer := valueof(ts_GtpPeerU(apars.sgsn_ip_u));
 	var PDU_SN sndcp := valueof(ts_SN_UD(apars.nsapi, payload));
 	BSSGP.send(ts_LLC_UI(enc_PDU_SN(sndcp), apars.sapi, '0'B, 0));
-	f_gtpu_send(apars, payload);
 	/* Expect PDU via GTP from SGSN on simulated GGSN */
 	alt {
 	[] GTP.receive(tr_GTPU_GPDU(peer, apars.ggsn_tei_u, payload));