f_verify_talloc_count: mtc.stop

If the talloc count matching failed, immediately stop the failed test.

It is currently used by BSC_Tests.ttcn, and will soon also be used by
HNBGW_Tests.ttcn. These tests were used to uncover memory leaks, and
can now remain to guard against new leaks being introduced.

Change-Id: Id2b29beecf1c0652fb8d75e031e5c0dc9aa27975
diff --git a/library/Osmocom_VTY_Functions.ttcn b/library/Osmocom_VTY_Functions.ttcn
index e4a9182..6e3ee37 100644
--- a/library/Osmocom_VTY_Functions.ttcn
+++ b/library/Osmocom_VTY_Functions.ttcn
@@ -287,7 +287,7 @@
 		log("count mismatch, retrying in ", wait_time);
 		f_sleep(wait_time);
 	}
-	setverdict(fail, "talloc count mismatch");
+	Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail, "talloc count mismatch");
 }
 
 }