8263846: Bad JNI lookup getFocusOwner in accessibility code on Mac OS X

Reviewed-by: azvegint, prr
diff --git a/src/java.desktop/macosx/native/libawt_lwawt/awt/JavaComponentAccessibility.m b/src/java.desktop/macosx/native/libawt_lwawt/awt/JavaComponentAccessibility.m
index 3f11cd7..225d37c 100644
--- a/src/java.desktop/macosx/native/libawt_lwawt/awt/JavaComponentAccessibility.m
+++ b/src/java.desktop/macosx/native/libawt_lwawt/awt/JavaComponentAccessibility.m
@@ -1456,6 +1456,7 @@
 - (id)accessibilityFocusedUIElement
 {
     JNIEnv *env = [ThreadUtilities getJNIEnv];
+    GET_CACCESSIBILITY_CLASS_RETURN(nil);
     DECLARE_STATIC_METHOD_RETURN(jm_getFocusOwner, sjc_CAccessibility, "getFocusOwner",
                                   "(Ljava/awt/Component;)Ljavax/accessibility/Accessible;", nil);
     id value = nil;