sgsn: fix typo in comment of BSSGP_ConnHdlrPars:imsi

Change-Id: I544a626d914075c0fcf13017553017b898525e8c
diff --git a/sgsn/SGSN_Tests.ttcn b/sgsn/SGSN_Tests.ttcn
index 912a507..bccee7f 100644
--- a/sgsn/SGSN_Tests.ttcn
+++ b/sgsn/SGSN_Tests.ttcn
@@ -80,7 +80,7 @@
 type record BSSGP_ConnHdlrPars {
 	/* IMEI of the simulated ME */
 	hexstring imei,
-	/* IMEI of the simulated MS */
+	/* IMSI of the simulated MS */
 	hexstring imsi,
 	/* MSISDN of the simulated MS (probably unused) */
 	hexstring msisdn,