surfaceflinger_fuzzer: Bug Fix

Resolved Abort due to improper message handling. Handled the messages scheduled via postMessage() in fuzzer.

exec/s: 40
Test: ./surfaceflinger_fuzzer clusterfuzz-testcase-minimized-surfaceflinger_fuzzer-5382002773655552
Test: ./surfaceflinger_fuzzer clusterfuzz-testcase-minimized-surfaceflinger_fuzzer-5163836271296512
Bug: 291500072
Bug: 294639179

Change-Id: I874f95bfe92de7e8adc462b66867429c2d8834b5
diff --git a/services/surfaceflinger/fuzzer/surfaceflinger_fuzzers_utils.h b/services/surfaceflinger/fuzzer/surfaceflinger_fuzzers_utils.h
index 867a198..c679b14 100644
--- a/services/surfaceflinger/fuzzer/surfaceflinger_fuzzers_utils.h
+++ b/services/surfaceflinger/fuzzer/surfaceflinger_fuzzers_utils.h
@@ -278,7 +278,7 @@
 
     // MessageQueue overrides:
     void scheduleFrame() override {}
-    void postMessage(sp<MessageHandler>&&) override {}
+    void postMessage(sp<MessageHandler>&& handler) override { handler->handleMessage(Message()); }
 };
 
 } // namespace scheduler