Correct a trace in cleanupPostRender

Bug: 190529454
Test: NA

Ic2f4384cd1957c928a0ef656a98eb0041e29622c accidentally used the wrong
method name in cleanupPostRender, leading to misleading traces. Use the
proper name.

Change-Id: Ifa7248b03b13b2e3f41e841f3d9f082da7abcbe9
diff --git a/libs/renderengine/threaded/RenderEngineThreaded.cpp b/libs/renderengine/threaded/RenderEngineThreaded.cpp
index 9a8201f..a549672 100644
--- a/libs/renderengine/threaded/RenderEngineThreaded.cpp
+++ b/libs/renderengine/threaded/RenderEngineThreaded.cpp
@@ -292,7 +292,7 @@
     {
         std::lock_guard lock(mThreadMutex);
         mFunctionCalls.push([=](renderengine::RenderEngine& instance) {
-            ATRACE_NAME("REThreaded::unmapExternalTextureBuffer");
+            ATRACE_NAME("REThreaded::cleanupPostRender");
             instance.cleanupPostRender();
         });
     }