Temporarily don't return the current buffer in synchronous mode

activate synchronous mode by default.
diff --git a/libs/gui/tests/SurfaceTextureClient_test.cpp b/libs/gui/tests/SurfaceTextureClient_test.cpp
index da04b4a..e1a85f3 100644
--- a/libs/gui/tests/SurfaceTextureClient_test.cpp
+++ b/libs/gui/tests/SurfaceTextureClient_test.cpp
@@ -505,11 +505,11 @@
 
     ASSERT_EQ(OK, anw->dequeueBuffer(anw.get(), &buf[0]));
     ASSERT_EQ(OK, anw->queueBuffer(anw.get(), buf[0]));
+    thread->run();
     ASSERT_EQ(OK, anw->dequeueBuffer(anw.get(), &buf[1]));
     ASSERT_EQ(OK, anw->queueBuffer(anw.get(), buf[1]));
-    thread->run();
-    ASSERT_EQ(OK, anw->dequeueBuffer(anw.get(), &buf[2]));
-    ASSERT_EQ(OK, anw->queueBuffer(anw.get(), buf[2]));
+    //ASSERT_EQ(OK, anw->dequeueBuffer(anw.get(), &buf[2]));
+    //ASSERT_EQ(OK, anw->queueBuffer(anw.get(), buf[2]));
     thread->bufferDequeued();
     thread->requestExitAndWait();
 }