sgsn: Fix comment [cosmetic]

Change-Id: I320bce9af64edf0cfb6f600d9a4c19b73153c805
diff --git a/sgsn/SGSN_Tests.ttcn b/sgsn/SGSN_Tests.ttcn
index 9d191cc..84902a4 100644
--- a/sgsn/SGSN_Tests.ttcn
+++ b/sgsn/SGSN_Tests.ttcn
@@ -1475,7 +1475,7 @@
 	}
 }
 
-/* Transceive given 'payload' as MT message from Gb -> OsmoSGSN -> GTP */
+/* Transceive given 'payload' as MO message from Gb -> OsmoSGSN -> GTP */
 private function f_gtpu_xceive_mo(inout PdpActPars apars, octetstring payload, integer ran_index := 0)
 runs on BSSGP_ConnHdlr {
 	/* Send PDU via SNDCP/LLC/BSSGP/NS via simulated MS/PCU to the SGSN */