Fix up soon to be compile errors (you must "do something" with the result of these method calls).

PiperOrigin-RevId: 397333743
diff --git a/src/java_tools/import_deps_checker/javatests/com/google/devtools/build/importdeps/testdata/Client.java b/src/java_tools/import_deps_checker/javatests/com/google/devtools/build/importdeps/testdata/Client.java
index fd5b103..8932c22 100644
--- a/src/java_tools/import_deps_checker/javatests/com/google/devtools/build/importdeps/testdata/Client.java
+++ b/src/java_tools/import_deps_checker/javatests/com/google/devtools/build/importdeps/testdata/Client.java
@@ -51,7 +51,7 @@
   @MethodAnnotation(name = "method")
   public void method(@ParameterAnnotation(position = 0) int p, Library.Class2 p2)
       throws LibraryException {
-    Objects.nonNull(p2); // javac9 silently uses Objects.
+    boolean unused = Objects.nonNull(p2); // javac9 silently uses Objects.
     Class3 c3 = new Class3();
     Class4 c4 = c3.field;
     c3.field = c4;