libbinder: tests w/o '-Wno-*'

Test: atest --test-mapping .
Change-Id: Id21c53fc2a4a308539b5354f34c3ee1e529b8b49
diff --git a/libs/binder/tests/schd-dbg.cpp b/libs/binder/tests/schd-dbg.cpp
index ec9534a..ab4c56a 100644
--- a/libs/binder/tests/schd-dbg.cpp
+++ b/libs/binder/tests/schd-dbg.cpp
@@ -290,6 +290,7 @@
 
   sta = tickNow();
   status_t ret = workers[target]->transact(BINDER_NOP, data, &reply);
+  ASSERT(ret == NO_ERROR);
   end = tickNow();
   results_fifo->add_time(tickNano(sta, end));