BTS: fix f_get_si3(): do not return uninitialized SI value

Change-Id: Ie60ef237443043578a218dcf19fe1b474b1d4e10
Signed-off-by: Vadim Yanitskiy <axilirator@gmail.com>
diff --git a/bts/BTS_Tests.ttcn b/bts/BTS_Tests.ttcn
index 7191a7d..6f43a44 100644
--- a/bts/BTS_Tests.ttcn
+++ b/bts/BTS_Tests.ttcn
@@ -4899,7 +4899,7 @@
 		repeat;
 		}
 	[] T.timeout {
-		setverdict(fail, "Timeout waiting for SI3");
+		Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail, "Timeout waiting for SI3");
 		}
 	}
 	return si.payload.si3;