StandardJavaFileManager.inferBinaryName will give extra message with PLATFORM_CLASS_PATH

<Testcase>
import javax.tools.*;
import static javax.tools.StandardLocation.*;
import static javax.tools.JavaFileObject.Kind.*;

public class Foo {
     public static void main(String... arg) throws Exception {
         JavaCompilerTool javac = ToolProvider.getSystemJavaCompilerTool();
         JavaFileManager jfm = javac.getStandardFileManager(null);
         JavaFileObject jfo = jfm.getJavaFileForInput(CLASS_PATH,"Foo",SOURCE);
System.out.println(jfm.inferBinaryName(PLATFORM_CLASS_PATH,jfo));
     }
}
</Testcase>

<output>
bash-3.00$ java Foo
inferBinaryName failed for ./Foo.java
null
</output>

As per the spec, inferBinaryName should return 'null'.
Extra message "inferBinaryName failed for ./Foo.java" is not required.

<java-version>

</java-version>