Allow ignoring return values when checking if class is mockable

Test: make -j javac-check RUN_ERROR_PRONE=true
Change-Id: I5094fa145fc5f6d5c5d9426b07d764c07e545819
Merged-In: I5094fa145fc5f6d5c5d9426b07d764c07e545819

media/tests/MediaFrameworkTest/src/com/android/mediaframeworktest/unit/ImageReaderTest.java

@@ -41,6 +41,7 @@ public class ImageReaderTest extends AndroidTestCase {
     private Image mImage3;
 
     @Override
+    @SuppressWarnings("CheckReturnValue")
     protected void setUp() throws Exception {
         super.setUp();