macosx: Fix postprocessing menu item

This closes #2814
(cherry picked from commit 20967dfe)

modules/gui/macosx/intf.m

@@ -1881,20 +1881,11 @@ end:
             [o_controls setupVarMenuItem: o_mi_deinterlace target: (vlc_object_t *)p_vout
                 var: "deinterlace" selector: @selector(toggleVar:)];
 
-#if 0
-/* FIXME Post processing. */
-            p_dec_obj = (vlc_object_t *)vlc_object_find(
-                                                 (vlc_object_t *)p_vout,
-                                                 VLC_OBJECT_DECODER,
-                                                 FIND_PARENT );
-            if( p_dec_obj != NULL )
-            {
+#if 1
            [o_controls setupVarMenuItem: o_mi_ffmpeg_pp target:
-                    (vlc_object_t *)p_dec_obj var:"ffmpeg-pp-q" selector:
+                    (vlc_object_t *)p_vout var:"postprocess" selector:
                     @selector(toggleVar:)];
 
-                vlc_object_release(p_dec_obj);
-            }
 #endif
             vlc_object_release( (vlc_object_t *)p_vout );
         }