tests: Suppress new ErrorProne check
diff --git a/agent/src/test/java/com/code_intelligence/jazzer/instrumentor/TraceDataFlowInstrumentationTarget.java b/agent/src/test/java/com/code_intelligence/jazzer/instrumentor/TraceDataFlowInstrumentationTarget.java
index 48f16e6..d8e2888 100644
--- a/agent/src/test/java/com/code_intelligence/jazzer/instrumentor/TraceDataFlowInstrumentationTarget.java
+++ b/agent/src/test/java/com/code_intelligence/jazzer/instrumentor/TraceDataFlowInstrumentationTarget.java
@@ -37,6 +37,7 @@
 
   volatile int switchValue = 1200;
 
+  @SuppressWarnings("ReturnValueIgnored")
   @Override
   public Map<String, Boolean> selfCheck() {
     Map<String, Boolean> results = new HashMap<>();